KISHIKAWA Keiki

J-GLOBAL         Last updated: Dec 11, 2018 at 15:35
 
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Name
KISHIKAWA Keiki
Affiliation
Chiba University
Job title
Chiba University
Degree
Ph.D., (BLANK)

Research Areas

 
 

Academic & Professional Experience

 
Apr 2008
 - 
Today
Professor, Graduate School of Engineering, Chiba university
 
Apr 2015
 - 
Mar 2016
Part-time Lecturer, Faculty of Engineering, Gifu University
 
Apr 2008
 - 
Mar 2009
Part-time Lecturer, Institute for Materials Chemistry and Engineering, Kyushu University
 
Apr 2007
 - 
Apr 2008
Associate Professor, Graduate School of Engineering, Chiba university
 
Apr 2002
 - 
Mar 2007
Part-time Lecturer, Faculty of Science and Engineering, Tokyo University of Science
 
Apr 1999
 - 
Mar 2007
Associate Professor, Materials Chemistry, faculty of Engineering, Chiba university
 
1992
 - 
1999
Assistant Professor, Materials Science, Faculty of Enginering, Chiba university
 
Oct 1997
 - 
Oct 1998
Visiting Scientist, Chemistry (Prof. T. M. Swager ), Massachusetts Institute of Technology
 
Apr 1990
 - 
Dec 1991
Mitsui Petro chemical Industry
 

Education

 
Apr 1987
 - 
Mar 1990
Mathematics and Materials Sciences, Graduate School of Natural Science, Chiba University
 
Apr 1981
 - 
Mar 1985
Industrial Chemistry, Faculty of Engineering, Chiba University
 
Apr 1985
 - 
Mar 1987
Industrial Chemistry, Graduate School of Engineering, Chiba University
 

Published Papers

 
Iwasaki Takeshi, Tamai Yuki, Yamamoto Mikiya, Taniguchi Tatsuo, Kishikawa Keiki, Kohri Michinari
LANGMUIR   34(39) 11814-11821   Oct 2018   [Refereed]
Kohri Michinari, Yanagimoto Kenshi, Kohaku Kotona, Shiomoto Shohei, Kobayashi Motoyasu, Imai Akira, Shiba Fumiyuki, Taniguchi Tatsuo, Kishikawa Keiki
MACROMOLECULES   51(17) 6740-6745   Sep 2018   [Refereed]
Kohri Michinari, Yanagimoto Kenshi, Kawamura Ayaka, Hamada Kosuke, Imai Yoshihiko, Watanabe Takaichi, Ono Tsutomu, Taniguchi Tatsuo, Kishikawa Keiki
ACS APPLIED MATERIALS & INTERFACES   10(9) 7640-7648   Mar 2018   [Refereed]
? 2017 American Chemical Society. Nature creates beautiful structural colors, and some of these colors are produced by nanostructural arrays of melanin. Polydopamine (PDA), an artificial black polymer produced by self-oxidative polymerization of d...
Kohri Michinari, Yamazaki Shigeaki, Kawamura Ayaka, Taniguchi Tatsuo, Kishikawa Keiki
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   532 564-569   Nov 2017   [Refereed]
? 2017 Elsevier B.V. Some beautiful structural colorations found in nature are produced by microstructures of melanin. Polydopamine (PDA), produced by the self-oxidative polymerization of dopamine, is known as a mimetic material of melanin. Previo...
Hisamatsu Shugo, Suzuki Shinichi, Kohmoto Shigeo, Kishikawa Keiki, Yamamoto Yusuke, Motokawa Ryuhei, Yaita Tsuyoshi
TETRAHEDRON   73(27-28) 3993-3998   Jul 2017   [Refereed]
Kishikawa Keiki, Furukawa Yuki, Watanabe Tomohiro, Kohri Michinari, Taniguchi Tatsuo, Kohmoto Shigeo
LIQUID CRYSTALS   44(8) 1332-1339   Jun 2017   [Refereed]
? 2017 Informa UK Limited, trading as Taylor & Francis Group. Blue phases (BPs) obtained by doping a commercially available liquid crystalline compound (4-butyl-N-(4-ethoxybenzylidene)aniline (EBBA)) with (2R,3R)-2,3-bis(4-octyloxyphenylbenzoylo...
Kishikawa Keiki, Furukawa Yuki, Watanabe Tomohiro, Kohri Michinari, Taniguchi Tatsuo, Kohmoto Shigeo
LIQUID CRYSTALS   44(6) 956-968   May 2017   [Refereed]
? 2016 Informa UK Limited, trading as Taylor & Francis Group. Novel C2-symmetric chiral dopant derivatives, namely, N-substituted (2R, 3R)-2,3-bis(4-(4-octyloxyphenyl)benzoyloxy)succinimides1a-h, were synthesised, and the effects of the N-substi...
Kawamura Ayaka, Kohri Michinari, Yoshioka Shinya, Taniguchi Tatsuo, Kishikawa Keiki
LANGMUIR   33(15) 3824-3830   Apr 2017   [Refereed]
? 2017 American Chemical Society. We present the ability to tune structural colors by mixing colloidal particles. To produce high-visibility structural colors, melanin-like core-shell particles composed of a polystyrene (PSt) core and a polydopami...
Kishikawa Keiki, Yamamoto Yusuke, Watanabe Go, Kawamura Ayaka, Kohri Michinari, Taniguchi Tatsuo
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   56(16) 4598-4602   Apr 2017   [Refereed]
Kawamura Ayaka, Kohri Michinari, Oku Hiroyuki, Hamada Kosuke, Nakagawa Keisuke, Taniguchi Tatsuo, Kishikawa Keiki
KOBUNSHI RONBUNSHU   74(1) 54-58   Jan 2017   [Refereed]
?2017, The Society of Polymer Science. The structural color of Rock Pigeon feathers is produced by thin-layer interference, which occurs in the cortex layer of the barbule. Furthermore, melanin granules, which exist below the cortex layer, absorb ...
Hamada Kosuke, Kohri Michinari, Taniguchi Tatsuo, Kishikawa Keiki
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   512 80-86   Jan 2017   [Refereed]
? 2016 Elsevier B.V. We describe a facile and simple method to prepare colloidal architectures by the in situ assembly of amphiphilic diblock copolymers onto submicron-sized core particles. Polystyrene-b-poly(acrylic acid) diblock copolymers (PStm...
Shugo Hisamatsu, Shinichi Suzuki, Shigeo Kohmoto, Keiki Kishikawa, Yusuke Yamamoto, Ryuhei Motokawa, Tsuyoshi Yaita
Tetrahedron      Jan 2017
? 2017 Elsevier Ltd A sensory system incorporated with an amplification function was developed for the detection of trace-level fluoride ions. This sensory system comprises two steps: amplification and chemiluminescence. These steps were linked wi...
Keiki Kishikawa, Yusuke Yamamoto, Go Watanabe, Ayaka Kawamura, Michinari Kohri, Tatsuo Taniguchi
Angewandte Chemie - International Edition      Jan 2017
? 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim In achiral rod-like molecules, a nematic phase is the most disordered liquid crystal phase, which only has one-directional order in the direction of the molecular long axis. A dumbbell-shaped mol...
Kawamura Ayaka, Kohri Michinari, Morimoto Gen, Nannichi Yuri, Taniguchi Tatsuo, Kishikawa Keiki
SCIENTIFIC REPORTS   6    Sep 2016   [Refereed]
? The Author(s) 2016. The beautiful structural colors in bird feathers are some of the brightest colors in nature, and some of these colors are created by arrays of melanin granules that act as both structural colors and scattering absorbers. Insp...
Takai Atsuro, Kajitani Takashi, Fukushima Takanori, Kishikawa Keiki, Yasuda Takeshi, Takeuchi Masayuki
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   138(35) 11245-11253   Sep 2016   [Refereed]
? 2016 American Chemical Society. We design a new naphthalenediimide (NDI) π-system, NDI-Fc-NDI, having a ferrocene linker as a hinge unit and long alkyl chains as supramolecular assembling units. The NDI units are "directionally flexible" in conc...
Aikawa Tatsuo, Mizuno Akihiro, Kohri Michinari, Taniguchi Tatsuo, Kishikawa Keiki, Nakahira Takayuki
COLLOIDS AND SURFACES B-BIOINTERFACES   145 152-159   Sep 2016   [Refereed]
? 2016 Elsevier B.V. Luminescent particles have been attracting significant attention because they can be used in biochemical applications, such as detecting and imaging biomolecules. In this study, luminescent polystyrene latex particles were pre...
Motokawa Ryuhei, Taniguchi Tatsuo, Kumada Takayuki, Iida You, Aoyagi Shota, Sasaki Yusuke, Kohri Michinari, Kishikawa Keiki
MACROMOLECULES   49(16) 6041-6049   Aug 2016   [Refereed]
? 2016 American Chemical Society. We present a method for fabricating photonic crystals (PCs) by polymerization-induced microphase separation of block copolymers (BCPs). Molecular weight of BCP for PCs is so large that it has been difficult for co...
Michinari Kohri, Tatsuo Taniguchi, Keiki Kishikawa
Methods in Molecular Biology      Jan 2016
? Springer Science+Business Media New York 2016. Glycopolymers bearing carbohydrates have an advantage in protein recognition that is attributable to the multivalent effect (cluster effect) of side-chain carbohydrates. A variety of surface-modifie...
Sasaki Yusuke, Konishi Naho, Kasuya Masakatsu, Kohri Michinari, Taniguchi Tatsuo, Kishikawa Keiki
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   482 68-78   Oct 2015   [Refereed]
? 2015 Elsevier B.V. Polystyrene latex particles with controlled size were prepared by polymerization of oil-in-water (O/W) emulsion styrene droplets obtained through the phase inversion temperature (PIT) emulsification using amphiphilic comb-like...
Keiki Kishikawa
Advances in Organic Crystal Chemistry: Comprehensive Reviews 2015      Aug 2015
? Springer Japan 2015. All rights are reserved. Electro-Responsive columnar liquid crystal (ER-CLC) materials were reviewed, especially ferroelectric columnar materials (FCLC). The history of polar columns are introduced with recent progress towar...
Kohmoto Shigeo, Chuko Tomotaka, Hisamatsu Shugo, Okuda Yasuhiro, Masu Hyuma, Takahashi Masahiro, Kishikawa Keiki
CRYSTAL GROWTH & DESIGN   15(6) 2723-2731   Jun 2015   [Refereed]
? 2015 American Chemical Society. Piezoluminescence and liquid crystallinity of anthracene-based bispyridinium salts were investigated in stimulus-responsive luminescent organic crystals and luminescent ionic liquid crystals. The salts possess an ...
Hisamatsu Shugo, Masu Hyuma, Takahashi Masahiro, Kishikawa Keiki, Kohmoto Shigeo
CRYSTAL GROWTH & DESIGN   15(5) 2291-2302   May 2015   [Refereed]
? 2015 American Chemical Society. Anthracene derivatives possessing a carbamate group and an ester group at their 9- and 10-positions, respectively, were prepared to furnish pairwise packing of anthracene fluorophores in their crystal structures. ...
Kishikawa Keiki, Inoue Takahiro, Hasegawa Naoshi, Takahashi Masahiro, Kohri Michinari, Taniguchi Tatsuo, Kohmoto Shigeo
JOURNAL OF MATERIALS CHEMISTRY C   3(15) 3574-3581   Apr 2015   [Refereed]
? 2015 The Royal Society of Chemistry. Biaxial smectic A (SmAb) and biaxial nematic (Nb) liquid crystal (LC) phases using achiral straight-rod molecules were realized through perfluoroarene-arene (PFA-A) and CH/F interactions. Compounds 1a, 1b and...
Kohri Michinari, Nannichi Yuri, Taniguchi Tatsuo, Kishikawa Keiki
JOURNAL OF MATERIALS CHEMISTRY C   3(4) 720-724   2015   [Refereed]
Kasuya Masakatsu, Taniguchi Tatsuo, Kohri Michinari, Kishikawa Keiki, Nakahira Takayuki
POLYMER   55(20) 5080-5087   Sep 2014   [Refereed]
? 2014 Elsevier Ltd. All rights reserved. We prepared the novel fluorescent polymer latex particles which can change their fluorescence intensity in response to the increasing NaCl concentration in water. Core polymer latex particles were synthesi...
Kishikawa Keiki, Aoyagi Shota, Kohri Michinari, Taniguchi Tatsuo, Takahashi Masahiro, Kohmoto Shigeo
SOFT MATTER   10(34) 6582-6588   Sep 2014   [Refereed]
A simple chiral dopant molecule (R)-1 with both rod- and arch-like units was prepared, and extremely large helical twisting powers (+123 to +228 μm-1) in nematic liquid crystal phases were achieved. We have demonstrated that the introduction of an...
Kishikawa Keiki, Sugiyama Takaaki, Watanabe Tomohiro, Aoyagi Shota, Kohri Michinari, Taniguchi Tatsuo, Takahashi Masahiro, Kohmoto Shigeo
JOURNAL OF PHYSICAL CHEMISTRY B   118(34) 10319-10332   Aug 2014   [Refereed]
Shiki Yagai, Shiki Yagai, Satoru Okamura, Yujiro Nakano, Mitsuaki Yamauchi, Keiki Kishikawa, Takashi Karatsu, Akihide Kitamura, Akira Ueno, Daiki Kuzuhara, Hiroko Yamada, Hiroko Yamada, Tomohiro Seki, Hajime Ito
Nature Communications      Jun 2014
π-Conjugated compounds that exhibit tunable luminescence in the solid state under external mechanical stimuli have potential applications in sensors and imaging devices. However, no rational designs have been proposed that impart these mechano-res...
Kishikawa Keiki, Watanabe Tomohiro, Kohri Michinari, Taniguchi Tatsuo, Takahashi Masahiro, Kohmoto Shigeo
LIQUID CRYSTALS   41(6) 839-849   Jun 2014   [Refereed]
Yagai Shiki, Okamura Satoru, Nakano Yujiro, Yamauchi Mitsuaki, Kishikawa Keiki, Karatsu Takashi, Kitamura Akihide, Ueno Akira, Kuzuhara Daiki, Yamada Hiroko, Seki Tomohiro, Ito Hajime
NATURE COMMUNICATIONS   5    Jun 2014   [Refereed]
Kohmoto Shigeo, Sekizawa Shingo, Hisamatsu Shugo, Masu Hyuma, Takahashi Masahiro, Kishikawa Keiki
CRYSTAL GROWTH & DESIGN   14(5) 2209-2217   May 2014   [Refereed]
Phenylenediurea dibenzoic acid derivatives 1, 2, 3, and 5 and an amide derivative 4 were synthesized, and their molecular structures were elucidated to be an S-shape by single crystal X-ray analysis. Crystals of 1 were obtained as a DMF solvate, w...
Kohri Michinari, Nannichi Yuri, Kohma Hiroto, Abe Daisuke, Kojima Takashi, Taniguchi Tatsuo, Kishikawa Keiki
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   449 114-120   May 2014   [Refereed]
The facile preparation of nonspherical raspberry-like particles composed of a polystyrene (PSt) core and polydopamine (PDA) nodules was described. Various polymerization parameters influencing the PDA nodules were investigated in detail. It was fo...
Keiki Kishikawa, Takaaki Sugiyama, Tomohiro Watanabe, Shota Aoyagi, Michinari Kohri, Tatsuo Taniguchi, Masahiro Takahashi, Shigeo Kohmoto
Journal of Physical Chemistry B      Jan 2014
Blue phases (BPs) have received considerable attention as light shutters in the next generation of liquid crystal (LC) displays. However, no simple and efficient chiral dopant for induction of BPs of commercially available rodlike LC compounds has...
Keiki Kishikawa, Tomohiro Watanabe, Michinari Kohri, Tatsuo Taniguchi, Masahiro Takahashi, Shigeo Kohmoto
Liquid Crystals      Jan 2014
To investigate the effect of the number of chiral mesogenic units and their spatial arrangement in dopant molecules on the induction of blue phases (BPs), and widening the temperature ranges of these phases, six benzene derivatives possessing (cho...
Kasuya Masakatsu, Taniguchi Tatsuo, Motokawa Ryuhei, Kohri Michinari, Kishikawa Keiki, Nakahira Takayuki
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY   51(19) 4042-4051   Oct 2013   [Refereed]
We developed a novel fluorescence labeling technique for quantification of surface densities of atom transfer radical polymerization (ATRP) initiators on polymer particles. The cationic P(St-CPEM-C4DMAEMA) and anionic P(St-CPEM) polymer latex part...
Kohri Michinari, Shinoda Yoshihiro, Kohma Hiroto, Nannichi Yuri, Yamauchi Mitsuaki, Yagai Shiki, Kojima Takashi, Taniguchi Tatsuo, Kishikawa Keiki
MACROMOLECULAR RAPID COMMUNICATIONS   34(15) 1220-1224   Aug 2013   [Refereed]
A free-standing polymer brush film with tailored thicknesses based on a colorless polydopamine (PDA) thin layer is prepared and characterized. The surface-initiated atom transfer radical polymerization (ATRP) of 2-hydroxyethyl methacrylate (HEMA) ...
Hisamatsu Shugo, Masu Hyuma, Takahashi Masahiro, Kishikawa Keiki, Kohmoto Shigeo
CRYSTAL GROWTH & DESIGN   13(6) 2327-2334   Jun 2013   [Refereed]
Crystal structures of U-shaped aromatic ureadicarboxylic acid possessing two carboxy moieties at meta-positions of phenyl rings were investigated. It afforded cocrystals with dipyridyl derivatives. In addition to the U-shaped conformation obtained...
Kohri Michinari, Kohma Hiroto, Shinoda Yoshihiro, Yamauchi Mitsuaki, Yagai Shiki, Kojima Takashi, Taniguchi Tatsuo, Kishikawa Keiki
POLYMER CHEMISTRY   4(9) 2696-2702   May 2013   [Refereed]
Herein, we describe a facile method to prepare a colorless functional polydopamine (PDA) thin layer by the in situ oxidative copolymerization of dopamine (DA) and ATRP initiator-bearing DA (DA-BiBB) onto polystyrene (PSt) core particles: PSt@PDA/B...
Keiki Kishikawa, Yuri Haga, Takahiro Inoue, Tomohiro Watanabe, Masahiro Takahashi, Shigeo Kohmoto
Chemistry Letters      Nov 2012
Nematic liquid-crystal phases doped with the novel dopant compounds 1 (C6F5COO(CH)nOCOC6F5, n = 17) and 2 (C6H5-COO(CH)nOCOC6H5, n = 17) showed an "opposite odd-even effect" on clearing temperatures. The tendency was exactly opposite to that repor...
Kishikawa Keiki, Haga Yuri, Inoue Takahiro, Watanabe Tomohiro, Takahashi Masahiro, Kohmoto Shigeo
CHEMISTRY LETTERS   41(11) 1465-1467   Nov 2012   [Refereed]
Kishikawa Keiki
ISRAEL JOURNAL OF CHEMISTRY   52(10) 800-808   Oct 2012   [Refereed]
Utilization of the perfluoroarene-arene interaction for stabilization of liquid crystal phases is reviewed. This interaction is strong (3.7-5.6kcal/mol), but it is difficult to generate stable liquid crystal phases by using it. From the examples i...
Hisamatsu Shugo, Masu Hyuma, Takahashi Masahiro, Kishikawa Keiki, Kohmoto Shigeo
TETRAHEDRON LETTERS   53(30) 3903-3906   Jul 2012   [Refereed]
Single crystal X-ray structures of cocrystals, 1?2 and 1?3, derived from U-shaped ureadicarboxylic acid (1) with 2-aminopyrimidine (2) and melamine (3), respectively, were examined. Cocrystals were obtained as a 1:1 mixture of 1 and the correspond...
Kohmoto Shigeo, Okuyama Shinpei, Yokota Nobuyuki, Takahashi Masahiro, Kishikawa Keiki, Masu Hyuma, Azumaya Isao
JOURNAL OF MOLECULAR STRUCTURE   1015 6-11   May 2012   [Refereed]
Crystal structures of three zwitterionic bisimidazolium salts 1-3 in which imidazolium sulfonate moieties were connected with aromatic linkers, p-xylylene, 4,4′-dimethylenebiphenyl, and phenylene, respectively, were examined. The latter two were o...
Kishikawa Keiki, Itoh Hiroyuki, Akiyama Seiji, Kobayashi Takahiro, Kohmoto Shigeo
JOURNAL OF MATERIALS CHEMISTRY   22(17) 8484-8491   May 2012   [Refereed]
As novel rodlike liquid crystalline ester compounds exhibiting blue phases (BPs), chiral 4-(4′-alkoxyphenyl)phenyl 4-(4′-alkoxyphenyl)benzoate derivatives (R-C 6H 4-C 6H 4-OCO-C 6H 4-C 6H 4-R′), 1 (R = R′ = (R)-1-methylheptyloxy, BP range: 1.6 K o...
Hisamatsu Shugo, Masu Hyuma, Azumaya Isao, Takahashi Masahiro, Kishikawa Keiki, Kohmoto Shigeo
CRYSTAL GROWTH & DESIGN   11(12) 5387-5395   Dec 2011   [Refereed]
In order to examine versatility of ureadicarboxylic acids as U-shaped building blocks for crystal engineering, their crystal structures and cocrystals with pyridine derivatives were investigated. H-bonding networks created by a sequential linking ...
Kishikawa Keiki, Isaka Miyuki, Takahashi Masahiro, Saito Kazuya, Kohmoto Shigeo
CHEMISTRY LETTERS   40(11) 1278-1279   Nov 2011   [Refereed]
Kohmoto Shigeo, Okuyama Shinpei, Yokota Nobuyuki, Takahashi Masahiro, Kishikawa Keiki, Masu Hyuma, Azumaya Isao
CRYSTAL GROWTH & DESIGN   11(9) 3698-3702   Sep 2011   [Refereed]
Organic crystals containing several types of water channels are generated by clipping water molecules with biszwitterionic imidazolium carboxylates as hydrogen-bonding acceptors. The types of water channels to be generated depend on the size and t...
Kohmoto Shigeo, Tsuyuki Ryota, Hara Yujiro, Kaji Akira, Takahashi Masahiro, Kishikawa Keiki
CHEMICAL COMMUNICATIONS   47(32) 9158-9160   Aug 2011   [Refereed]
Amphiphilic anthracene derivatives showed solvent-polarity-dependent fluorescence. Monomer emission and aggregation-induced emission (AIE) were observed in polar and non-polar organic solvents, respectively. AIE became predominant in aqueous solut...
Kishikawa Keiki, Inoue Takahiro, Sasaki Yoshiyuki, Aikyo Sumihiro, Takahashi Masahiro, Kohmoto Shigeo
SOFT MATTER   7(16) 7532-7538   Aug 2011   [Refereed]
Compounds 1a-j, 4-alkoxy-4′-pentafluorobenzoyloxybiphenyls, were synthesized to investigate the biaxiality in the smectic A phases of rod-like molecules possessing both perfluorinated and non-fluorinated benzene rings. The phase behaviors of the c...
Takahashi Masahiro, Kimura Yutaka, Hagiwara Mitsuki, Kishikawa Keiki, Kohmoto Shigeo
SYNTHETIC METALS   161(15-16) 1557-1562   Aug 2011   [Refereed]
Improved synthesis and reinvestigation of the magnetic properties of triphenylamine bearing three nitronylnitroxide radicals (1) were carried out. Single crystal X-ray crystallographic analysis of 1 established that its molecular shape had a C3-sy...
Kohmoto Shigeo, Okuyama Shinpei, Nakai Takayuki, Takahashi Masahiro, Kishikawa Keiki, Masu Hyuma, Azumaya Isao
JOURNAL OF MOLECULAR STRUCTURE   998(1-3) 192-197   Jul 2011   [Refereed]
Single crystal X-ray structures of three imidazolium salts were examined. In contrast to imidazolium salt 1 possessing an ester group which created a network of C-H?halide-anion interactions with a linear array of imidazolium and the corresponding...
Kishikawa Keiki, Aikyo Sumihiro, Akiyama Seiji, Inoue Takahiro, Takahashi Masahiro, Yagai Shiki, Aonuma Hiroaki, Kohmoto Shigeo
SOFT MATTER   7(11) 5176-5187   Jun 2011   [Refereed]
In order to realize biaxial mesophases of straight rod-like molecules by introduction of lateral perfluoroarene-arene interactions, non-alkylated rod-like liquid crystalline compounds C6X5-COO-C6Z4-C6Z4-OOC-C6Y5, F-BB-F (X = Y = F, Z = H), F-BB-B ...
Hisamatsu Shugo, Masu Hyuma, Azumaya Isao, Takahashi Masahiro, Kishikawa Keiki, Kohmoto Shigeo
CRYSTAL GROWTH & DESIGN   11(5) 1453-1457   May 2011   [Refereed]
U-shaped N,N'-dimethyl-N,N'-diphenylureadicarboxylic acid was developed as a folding unit to fabricate an H-bonding aromatic zigzag array. Recrystallization of it with dipyridyl derivatives gave cocrystals. Zigzag-type strands were formed by pinch...
Kohmoto Shigeo, Hisamatsu Shugo, Mitsuhashi Hakuei, Takahashi Masahiro, Masu Hyuma, Azumaya Isao, Yamaguchi Kentaro, Kishikawa Keiki
ORGANIC & BIOMOLECULAR CHEMISTRY   8(9) 2174-2179   Apr 2010   [Refereed]
Intramolecular [2+2] photocycloaddition of aromatic chain imides possessing bis-phenanthrene moieties afforded straight and cross ring closure products. The ratio of cycloadducts was dependent on reaction time and temperature, which resulted in a ...
Kohmoto Shigeo, Hara Yukiko, Kishikawa Keiki
TETRAHEDRON LETTERS   51(11) 1508-1511   Mar 2010   [Refereed]
Utilizing hydrogen bonding between pyridine and benzoic acids, hydrogen-bonded ionic liquid crystals were prepared from pyridinylmethylimidazolium and alkoxy-substituted benzoic acids. Depending on the number of alkoxy substituents, smectic C (SmC...
Kohmoto Shigeo, Motomura Tatsuya, Takahashi Masahiro, Kishikawa Keiki
JOURNAL OF MOLECULAR STRUCTURE   964(1-3) 47-51   Feb 2010   [Refereed]
Shigeo Kohmoto, Tatsuya Motomura, Masahiro Takahashi, Keiki Kishikawa
Journal of Molecular Structure      Feb 2010
Stabilization of norcaradiene structures of γ-lactone and lactam ring-fused 7-vinylnorcaradienes 1a-1e in their norcaradiene - cycloheptatriene valence isomerization was achieved by protonation. Induced 13C NMR chemical shifts caused by protonatio...
Kohmoto Shigeo, Someya Yasunobu, Kishikawa Keiki
LIQUID CRYSTALS   37(2) 209-216   Feb 2010   [Refereed]
The salts of 4-alkoxy-3,5-bis(hydroxymethyl)benzoic acids and alkylamine give stable smectic liquid crystals in a wide temperature range. These smectic phases were investigated by polarised optical microscopy, differential scanning calorimetry and...
Kishikawa Keiki, Nakahara Shoichiro, Natsukawa Masanori, Suzuki Keiichi, Kohmoto Shigeo
MOLECULAR CRYSTALS AND LIQUID CRYSTALS   516 107-113   Jan 2010   [Refereed]
Relation between the spontaneous polarization and alkyl chain length was investigated in ferroelectric switching of N,N'-bis(3,4,5-trialkoxyphenyl)urea (1-7) possessing n-C4H9, n-C8H17, n-C9H19, n-C10H21, n-C11H23, n-C12H25, and n-C16H33, respecti...
Kohmoto Shigeo, Kuroda Yu, Kishikawa Keiki, Masu Hyuma, Azumaya Isao
CRYSTAL GROWTH & DESIGN   9(12) 5017-5020   Dec 2009   [Refereed]
Two approaches to create hydrogen-bonding (H-bonding) cyclic dimers of tethered benzoic acids in a crystalline state were examined. The cyclic dimers of the methoxy derivative 1 were generated by inclusion of aromatic guest molecule s: benzene or ...
Kohmoto Shigeo, Kuroda Yu, Someya Yasunobu, Kishikawa Keiki, Masu Hyuma, Yamaguchi Kentaro, Azumaya Isao
CRYSTAL GROWTH & DESIGN   9(8) 3457-3462   Aug 2009   [Refereed]
As a new supramolecular tecton based on hydrogen bonding for crystal engineering, benzoic acid derivatives possessing two hydroxymethyl groups were developed and their crystal structures were investigated by single crystal X-ray analysis. The hydr...
Seiji Tanaka, Seiji Tanaka, Kazuhiro Kochi, Hiroyuki Ito, Jun Mukawa, Keiki Kishikawa, Makoto Yamamoto, Shigeo Kohmoto
Synthetic Communications      Jan 2009
β-Nitro alcohols were converted to the corresponding nitro imines in the presence of lithium hexmethyldisilazide (LHMDS) in one pot. The formal transformation of the hydroxy to imino group proceeded in a sequence of the retro nitro-aldol reaction ...
Kishikawa Keiki, Nakahara Shoichiro, Nishikawa Yohei, Natsukawa Masanori, Kohmoto Shigeo
MOLECULAR CRYSTALS AND LIQUID CRYSTALS   498 11-18   Jan 2009   [Refereed]
The phase behavior of N, N'-bis(3,4,5-trihexadecyloxyphenyl)urea (1) was investigated by differential scanning calorimetry, polarized optical microscopy, and X-ray diffraction. It was found that 1 exhibited two columnar phases, rectangular columna...
Tanaka Seiji, Kochi Kazuhiro, Ito Hiroyuki, Mukawa Jun, Kishikawa Keiki, Yamamoto Makoto, Kohmoto Shigeo
SYNTHETIC COMMUNICATIONS   39(5) 868-874   2009   [Refereed]
Noguchi Takao, Kishikawa Keiki, Kohmoto Shigeo
LIQUID CRYSTALS   35(8) 1043-1050   Aug 2008   [Refereed]
Ionic liquid crystals based on ionic complexation of tris(2-aminoethyl) amine (1) with 3,4,5-tris(7,7,8,8,9,9,10,10,11,11,12,12,12- tridecafluorododecyloxy)benzoic acid (2) and with 3,4,5-tris(2-octyldodecyloxy) benzoic acid (3) were investigated....
Noguchi Takao, Kishikawa Keiki, Kohmoto Shigeo
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN   81(6) 778-783   Jun 2008   [Refereed]
Yagai Shiki, Kubota Shun, Iwashima Tomoyuki, Kishikawa Keiki, Nakanishi Takashi, Karatsu Takashi, Kitamura Akihide
CHEMISTRY-A EUROPEAN JOURNAL   14(17) 5246-5257   Jun 2008   [Refereed]
Bis- and monoureas hybridized with the oligo(p-phenylene vinylene) (OPV) π-electronic segment and 3,4,5-tridodecyloxyphenyl wedge were synthesized and their supramolecular polymerization in diluted solution, gel formation in concentrated solution,...
Kishikawa Keiki
JOURNAL OF SYNTHETIC ORGANIC CHEMISTRY JAPAN   66(4) 368-376   Apr 2008   [Refereed]
Kishikawa Keiki, Hirai Akina, Kohmoto Shigeo
CHEMISTRY OF MATERIALS   20(5) 1931-1935   Mar 2008   [Refereed]
A polymerizable benzoic acid derivative, 3,5-bis(propenoyloxymethyl)-4- hexadecyloxybenzoic acid (1), was synthesized and complexed in a molar ratio of 2:1 with each of the dipyridyl compounds 4,4′-bipyridyl (2a), 1,2-dipyridylethane (2b), 1,2-dip...
Tanaka Seiji, Oguma Yukinari, Tanaka Yusuke, Echizen Hidenori, Masu Hyuma, Yamaguchi Kentaro, Kishikawa Keiki, Kohmoto Shigeo, Yamamoto Makoto
TETRAHEDRON   64(7) 1388-1396   Feb 2008   [Refereed]
Four-component synthesis of nitroimine derivatives (3) via double nitro-Mannich reaction was carried out in which nitroalkane, two moles of aldehyde, and lithium hexamethyldisilazide (LHMDS) were coupled in one-pot. In situ generated N-trimethylsi...
Kohmoto Shigeo, Takeichi Hiroshi, Kishikawa Keiki, Masu Hyuma, Azumaya Isao
TETRAHEDRON LETTERS   49(7) 1223-1227   Feb 2008   [Refereed]
Conformation of aromatic foldamers possessing three aromatic rings in a sequence of anthracene-phenylene-anthracene linked with iminodicarbonyl was examined. Their folding structures were confirmed by single crystal X-ray analysis. Two conformatio...
Noguchi Takao, Kishikawa Keiki, Kohmoto Shigeo
CHEMISTRY LETTERS   37(1) 12-13   Jan 2008   [Refereed]
The binary ionic liquid crystal composed of tris(2-amino-ethyl)amine (1) and 3,4-dioctyloxybenzoic acid (2) was investigated. The type of the mesophases with the highest thermal stability was found to be specific to the 1-2 molar ratios; 1:2 for t...
Kohmoto Shigeo, Tsuyuki Ryota, Masu Hyuma, Azumaya Isao, Kishikawa Keiki
TETRAHEDRON LETTERS   49(1) 39-43   Jan 2008   [Refereed]
Anthracene derivatives possessing pentafluorobenzoyloxy moieties at 9- and 10-positions showed polymorphism affording two types of fluorescent crystals with blue and bluish green fluorescence in their crystalline state, respectively. Their single ...
Keiki Kishikawa
Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry      Jan 2008
Introduction of lateral intermolecular interactions (dipole-dipole interactions, hydrogen bonds, and perfluoroarene-arene interactions) are attempted in rodlike and half-disklike molecules. In the cases of dicyanothiophenes, introduction of long c...
Kohmoto Shigeo, Mori Emiko, Kishikawa Keiki
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   129(44) 13364-+   Nov 2007   [Refereed]
Triphenylene derivatives possessing poly(ethylene oxide) (PEO) units exhibited discotic nematic (ND) phases at room temperature. Unique phase transition from a ND phase to a hexagonal columnar (Colh) phase was triggered by the addition of alkali m...
Yagai Shiki, Kinoshita Tetsuro, Higashi Masatsugu, Kishikawa Keiki, Nakanishi Takashi, Karatsu Takashi, Kitamura Akihide
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   129(43) 13277-13287   Oct 2007   [Refereed]
Upon complexation with bismelamine receptors (BMn) featuring different alkyl linker lengths (number of methylene groups (n) = 5-12), a barbituric acid merocyanine dye (1) can be loaded into diverse self-organized superstructures through multiple h...
Okada Yoshinori, Matsumoto Shohei, Araoka Fumito, Goto Masanao, Takanishi Yoichi, Ishikawa Ken, Nakahara Shoichiro, Kishikawa Keiki, Takezoe Hideo
PHYSICAL REVIEW E   76(4)    Oct 2007   [Refereed]
We have studied the polarization relaxation process after removing an applied electric field in the columnar hexagonal phase of N, N′ -bis(3,4,5-trihexadecyloxyphenyl)urea by means of second-harmonic generation (SHG), switching current, and textur...
Kawauchi Susumu, Choi Suk-Won, Fukuda Kaoru, Kishikawa Keiki, Watanabe Junji, Takezoe Hideo
CHEMISTRY LETTERS   36(6) 750-751   Jun 2007   [Refereed]
In this work, we carried out ab initio molecular orbital theory calculations for phenylbenzoate and N-benzylideneaniline, by which we will interpret unusual phenomenon of compounds 1 and 2. Copyright ? 2007 The Chemical Society of Japan.
Masaki Katoh, Shigeo Kohmoto, Keiki Kishikawa
Materials Letters      Jun 2007
Liquid crystalline dimers consisting of two rodlike cores, two terminal alkyl chains and an oligo(ethylene glycol) spacer were synthesized. Their phase behaviors and structures were investigated by polarized optical micrograph (POM), differential ...
Katoh Masaki, Kohmoto Shigeo, Kishikawa Keiki
MATERIALS LETTERS   61(14-15) 2915-2918   Jun 2007   [Refereed]
Okada Yoshinori, Araoka Fumito, Takanishi Yoichi, Ishikawa Ken, Nakahara Shoichiro, Kishikawa Keiki, Choi Hyunhee, Wu Jeong Weon, Takezoe Hideo
PHYSICAL REVIEW E   75(5)    May 2007   [Refereed]
The authors have measured the electro-optic Kerr effect in the isotropic phase of a urea derivative. Electric-field-induced birefringence Δn was observed in the isotropic phase even 30 °C above the isotropic-columnar phase transition temperature. ...
Kishikawa Keiki, Oda Katsuyuki, Aikyo Sumihiro, Kohmoto Shigeo
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION   46(5) 764-768   2007   [Refereed]
M. Katoh, S. Kohmoto, K. Kishikawa
Crystal Research and Technology      Dec 2006
The recrystallization of Heptakis[6-O-tert-butyldimethylsilyl)]-β- cyclodextrin (1) from ethyl acetate gave single crystals of 1 2?(ethyl acetate)3 complex. The superstructure of 12?(ethyl acetate)3 complex was investigated by 1H NMR spectroscopy,...
Masu Hyuma, Mizutani Ikuko, Kato Takako, Azumaya Isao, Yamaguchi Kentaro, Kishikawa Keiki, Kohmoto Shigeo
JOURNAL OF ORGANIC CHEMISTRY   71(21) 8037-8044   Oct 2006   [Refereed]
A circular dichroism (CD) spectral study on chiral aromatic chain imides possessing anthracene and naphthalene moieties with bulky N substituents showed that their helical chirality based on folding remained for a reasonably long time without race...
Masu Hyuma, Mizutani Ikuko, Ono Yohei, Kishikawa Keiki, Azumaya Isao, Yamaguchi Kentaro, Kohmoto Shigeo
CRYSTAL GROWTH & DESIGN   6(9) 2086-2091   Sep 2006   [Refereed]
Hyuma Masu, Ikuko Mizutani, Yohei Ono, Keiki Kishikawa, Isao Azumaya, Kentaro Yamaguchi, Shigeo Kohmoto
Crystal Growth and Design      Sep 2006
Fluorescence spectra of aromatic chain imides possessing anthracene and naphthalene moieties were examined both in solution and in the solid state. Depending on the substituents at the imide nitrogen atom, their fluorescence spectra varied in the ...
Choi Suk-Won, Fukuda Kaoru, Nakahara Shoichiro, Kishikawa Keiki, Takanishi Yoichi, Ishikawa Ken, Watanabe Junji, Takezoe Hideo
CHEMISTRY LETTERS   35(8) 896-897   Aug 2006   [Refereed]
The helical pitch of a chiral nematic (cholesteric: Ch) liquid crystal (LC) became shorter if an achiral compound 1 was added to a chiral host. This unusual behavior characteristic to ester compounds can be explained by the ability of the ester co...
Takatsuki Ken-ichi, Ohgushi Sumito, Kohmoto Shigeo, Kishikawa Keiki, Yamamoto Makoto
NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS   25(7) 719-734   Aug 2006   [Refereed]
Synthesis of antibiotics, puromycin and 3 ′-amino-3 ′-deoxy-N 6 ,N 6 -dimethyladenosine 11 was achieved by utilizing the cyclic sulfite 6a of the xylo -3 ′,5 ′-dihydroxy group as a new protective group. The key synthetic step is the deprotection o...
Hideo Takezoe, Hideo Takezoe, Keiki Kishikawa, Keiki Kishikawa, Ewa Gorecka
Journal of Materials Chemistry      Jun 2006
Disclike molecules form various columnar phases. Extensive efforts have been made to make these phases polar. In the course of these attempts, two columnar phases, in which dipoles along the column ferroelectrically switch, were discovered. In thi...
Kohmoto Shigeo, Someya Yasunobu, Masu Hyuma, Yamaguchi Kentaro, Kishikawa Keiki
JOURNAL OF ORGANIC CHEMISTRY   71(12) 4509-4515   Jun 2006   [Refereed]
Octahomotetraoxacalix[4]arenes bearing long alkyl chains on their lower rim were prepared. Ester 4a existed in a 1,2-alternate conformation in its crystal structure, which was examined by single-crystal X-ray diffraction analysis. To prepare liqui...
Yagai Shiki, Iwashima Tomoyuki, Kishikawa Keiki, Nakahara Shoichiro, Karatsu Takashi, Kitamura Akihide
CHEMISTRY-A EUROPEAN JOURNAL   12(15) 3984-3994   May 2006   [Refereed]
Self-assembling building blocks that are readily functionalizable and capable of achieving programmed hierarchical organization have enabled us to create various functional nanomaterials. We have previously demonstrated that N,N′-disubstituted 4,6...
Masaki Katoh, Satoshi Uehara, Shigeo Kohmoto, Keiki Kishikawa
Chemistry Letters      Mar 2006
Small C3-symmetric supramolecules, 1:3 complexes of tri(2-aminoethyl)amine (1) and 3,4,5-trialkoxybenzoic acid (2c-2n, R = (CH 2)n-1CH3, n = 5-16) generated a stable hexagonal columnar phase. The phase behaviors, stoichiometry, supramolecular stru...
Takashi Kajitani, Shigeo Kohmoto, Makoto Yamamoto, Keiki Kishikawa, Keiki Kishikawa
Molecular Crystals and Liquid Crystals      Dec 2005
Calamitic liquid crystalline amides 1-3 were synthesized and their thermodynamic behaviors were investigated. Bent-rod shaped compound 1 exhibited a usual smectic C phase. On the other hand, in the case of straight-rod compound 2, two kinds of sme...
Shiki Yagai, Toshiharu Nakajima, Keiki Kishikawa, Shigeo Kohmoto, Takashi Karatsu, Akihide Kitamura
Journal of the American Chemical Society      Aug 2005
Hydrogen-bonded disk-shaped aggregates (rosettes) composed of azobenzene-appended melamine and barbiturate or cyanurate are investigated in view of their hierarchical organization and photoresponsive behavior by 1H NMR and UV/vis spectroscopies, d...
Yoshinori Okada, Shohei Matsumoto, Yoichi Takanishi, Ken Ishikawa, Shoichiro Nakahara, Keiki Kishikawa, Hideo Takezoe
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics      Aug 2005
The polar order and its switching characteristics have been investigated by means of optical second-harmonic generation interferometry in a compound N,N′-bis(3,4,5-trialkoxylphenyl)urea (R=n-C16H33) being connected by intermolecular hydrogen bondi...
Takashi Kajitani, Shigeo Kohmoto, Makoto Yamamoto, Keiki Kishikawa
Chemistry of Materials      Jul 2005
The optical property and the molecular packing structure of achiral bent-rod-shaped liquid crystalline compound 1 possessing an amide group and a flexible spacer were investigated by polarized optical microscopy (POM), circular dichroism (CD) spec...
Hyuma Masu, Ken Ohmori, Keiki Kishikawa, Makoto Yamamoto, Kentaro Yamaguchi, Shigeo Kohmoto
Bulletin of the Chemical Society of Japan      Jun 2005
Single-crystal X-ray structures of 6 carboxamides possessing two units of 2-pyridone moieties connected with an iminodicarbonyl linker were examined to show the usefulness of this linker for the creation of concave-shaped conformation in crystal s...
Keiki Kishikawa, Shoichiro Nakahara, Yohei Nishikawa, Shigeo Kohmoto, Makoto Yamamoto
Journal of the American Chemical Society      Mar 2005
Novel columnar liquid crystalline compounds N,N′-bis(3,4,5- trialkoxylphenyl)ureas 1a-c (R = n-C8H17, n-C12H25, and n-C16H33) were synthesized, and their phase transitions were measured by differential scanning calorimetery. The superstructures we...
Hyuma Masu, Masaki Sakai, Keiki Kishikawa, Makoto Yamamoto, Kentaro Yamaguchi, Shigeo Kohmoto
Journal of Organic Chemistry      Feb 2005
(Chemical Equation Presented) Carboxamides possessing naphthalene rings connected by multiple iminodicarbonyl linkers were synthesized. These molecules forced the naphthalene rings to be placed in the positions facing each other, and they form hel...
Takashi Kajitani, Hyuma Masu, Shigeo Kohmoto, Makoto Yamamoto, Kentaro Yamaguchi, Keiki Kishikawa
Journal of the American Chemical Society      Feb 2005
Achiral rodlike molecules possessing an ester group generated a chiral smectic liquid crystal phase. Copyright ? 2005 American Chemical Society.

Books etc

 
Advances in Organic Crystal Chemistry
KISHIKAWA Keiki (Ed. by R. Tamura, M. Miyata) (Part:Joint Work, chaptor 33, pp 653-668)
Springer   2015   
Liquid Crystal-Frontier of Stractural Control and Functionalization
KISHIKAWA Keiki (Part:Joint Work, pp167-178)
Jun 2010   

Conference Activities & Talks

 
フォトクロミックナノカプセルの調製
都留陽介, 桑折道済, 谷口竜王, 岸川圭希, 林昌樹
高分子学会予稿集(CD-ROM)   29 Aug 2018   
カテコール基を導入した基材の刺激による表面特性制御
入江早紀, 桑折道済, 谷口竜王, 岸川圭希
高分子学会予稿集(CD-ROM)   29 Aug 2018   
人工メラニン粒子の異方性と集積構造が構造発色に与える影響
玉井友基, 桑折道済, 谷口竜王, 岸川圭希
高分子学会予稿集(CD-ROM)   29 Aug 2018   
原始移動ラジカル重合によるポリジビニルベンゼン多孔質粒表面の精密制御
屋代亜梨沙, 谷口竜王, 桑折道済, 岸川圭希, 唐津孝
高分子学会予稿集(CD-ROM)   29 Aug 2018   
RAFT重合により合成した両親媒性ブロックコポリマーを乳化剤に用いた磁性複合ラテックス粒子の作製
平口定叡, 桑折道済, 谷口竜王, 岸川圭希, 唐津孝
高分子学会予稿集(CD-ROM)   29 Aug 2018   
β‐ジケトン基含有高分子微粒子へのランタノイド元素の複合による機能化
山本幹也, 桑折道済, 谷口竜王, 岸川圭希
高分子学会予稿集(CD-ROM)   29 Aug 2018   
両親媒性ブロックポリマーを界面活性剤として用いたエマルションモノマー油滴の重合による液晶ナノカプセルの作製
児島伶奈, 桑折道済, 谷口竜王, 岸川圭希, 唐津孝, 岡部英二, 近藤史尚
高分子学会予稿集(CD-ROM)   29 Aug 2018   
磁性ポリマーネットワークを基盤とした着色磁性粒子の作製
小白琴菜, 桑折道済, 谷口竜王, 岸川圭希
高分子学会予稿集(CD-ROM)   29 Aug 2018   
金ナノ粒子との複合化による高輝度アップコンバージョンナノ粒子の作製
小山文音, 桑折道済, 谷口竜王, 岸川圭希, 唐津孝, 佐々木拓, 脇屋武司
高分子学会予稿集(CD-ROM)   29 Aug 2018   
ホスホニウム基を有する高分子微粒子とニッケルメッキ粒子とのヘテロ凝集
近澤匠, 成橋智真, 桑折道済, 谷口竜王, 岸川圭希, 唐津孝
高分子学会予稿集(CD-ROM)   29 Aug 2018   
PB35 Electro-responsive nonpolar liquid crystalline molecules
KISHIKAWA Keiki, YAMAMOTO Yusuke, TANIGUCHI Tatsuo, KOHRI Michinari
Proceedings of Japanese Liquid Crystal Society Annual meeting   2015   
We synthesized nonpolar liquid crystalline molecules consisting of hydrogen and carbon atoms. The rod-like compounds exhibited nematic liquid crystal phases. Despite the lack of hetero-atoms or polar groups, our nematic compounds showed electro-re...
PB23 Realization of ferroelectric columnar mesophase by constructing polymer network
KISHIKAWA Keiki, JIDO Keita, TANIGUCHI Tatsuo, KOHRI Michinari
Proceedings of Japanese Liquid Crystal Society Annual meeting   2015   
Mesomorphic urea compound 1 and polymerizable compound 2 were synthesized. Compound 1 exhibited a columnar mesophase. Though compound 1 showed a ferroelectric behavior, the polarity did not maintain because of the electrostatic repulsion between c...
PB22 Challenge to realization of high density memory device with ferroelectric columnar liquid crystalline phase
SAITO Kyohei, KISHIKAWA Keiki, TANIGUCHI Tatsuo, KOHRI Michinari
Proceedings of Japanese Liquid Crystal Society Annual meeting   2015   
To realize high density memory devices, a supramolecular compound was designed and synthesized. This compound is composed of a central urea and two trialkoxy benzoic acids possessing six polymerizable sites. After polymerization, it was expected t...
PA60 Generation of a ferroelectric columnar liquid crystal phase by using a liquid crystalline bisurea
KISHIKAWA Keiki, NAGAOKA Nozomi, TANIGUCHI Tatsuo, KOHRI Michinari
Proceedings of Japanese Liquid Crystal Society Annual meeting   2015   
Compound 1 possessing two urea groups in the molcule were designed and synthesized. Its phase transition was measured by polarized light optical microscopy and differential scanning calorimetery. In Xray diffraction measurement, it was classified ...
PA25 Behavior of a chiral dopant in in an equilibrium state in a chiral nematic phase
KISHIKAWA Keiki, SUGAI Kana, TANIGUCHI Tatsuo, KOHRI Michinari
Proceedings of Japanese Liquid Crystal Society Annual meeting   2015   
We recently synthesized a chiral dopant DA (Scheme1), with two rod-like units and a rigid arched unit. It is predicted that DA thermally decomposes and to recombines through retro-Diels-Alder and Diels-Alder reaction of anthracene and fumaryl este...
PA24 Polymerization of electro-responsive columnar liquid crystals and their molecular orientation control
KISHIKAWA Keiki, NONOSHITA Sho, TANIGUCHI Tatsuo, KOHRI Michinari
Proceedings of Japanese Liquid Crystal Society Annual meeting   2015   
We have been studying electro-responsive columnar liquid crystalline ureas. In this study, we attempted to synthesize novel ferroelectric columnar liquid crystals. To stabilize ferroelectricity acetyl groups were introduced at the terminal alkylch...
PA15 Elucidation of the molecular structure of the chiral dopants providing large HTPs and wide temperature range blue phase
Kishikawa Keiki, Furukawa Yuuki, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2015   
In this research, the chiral dopant molecules derived from tartaric acid was utilized for enlarging HTPs in nematic phases and widening blue phase temperature ranges. As a result, we clarified that the HTPs were affected by the interaction of the ...
PB37 Control of layer structures in smectic liquid crystals of fluorinated rod-like molecules by introducing various terminal chains
Kishikawa Keiki, Hasegawa Naoshi, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2013   
In order to realize an electro-responsive change in smectic layer spacings, we synthesized novel straight fluorinated rod-like molecules. We also synthesized the corresponding non-fluorinated rod-like molecules for the comparison. We investigated ...
PB03 Synthesis of effective chiral dopants possessing both rod-and arch-like control sites for the molecular arrangements in nematic phases
Kishikawa Keiki, Aoyagi Shota, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2013   
In this study, effective chiral dopants possessing both rod-and arch-like control sites for the molecular arrangements were synthesized. In the nematic phases doped with these dopant compounds, their HTP values and generation of blue phases were i...
PA44 Generation of blue phases by doping chiral tartarimide derivatives
Kishikawa Keiki, Watanabe Tomohiro, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2013   
The substituent effect of the N-alkyl chain of chiral tartarimides on stabilization of blue phases was investigated in the nematic phases of 5CB and EBBA. We investigated their HTPs and selective reflection wavelengths by polarized optical microsc...
PA42 Stabilization of ferroelectricity in liquid crystalline ureas by introducing aromatic groups to the peripheral parts of the columns
Kishikawa Keiki, Ohtsubo Ryoichi, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2013   
For realizing ferroelectric columnar mesophases, we synthesized novel liquid crystalline ureas. The compounds exhibited two types of columnar and smectic A liquid crystal phases. We investigated their phase behaviors and superstructures by polariz...
PA41 Anthracene-based Pyridinium Salts : Their Liquid Crystallinities and Fluorescent Properties
Kohmoto Shigeo, Chuko Tomotaka, Takahashi Masahiro, Kishikawa Keiki
Proceedings of Japanese Liquid Crystal Society Annual meeting   2013   
In order to develop fluorescent ionic liquid crystals, we prepared pyridinium salts possessing an anthracene fluorophore as a core. The salts showed columnar liquid crystal phases. The films derived from their liquid crystals by rapid cooling exhi...
PA05 Analysis of the super-structures of liquid crystalline thioureas
Kishikawa Keiki, Saito Takaho, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2013   
In this study, I synthesized liquid crystalline thiourea-compounds with a polarization in the axial direction. The compounds exhibited hexagonal columnar and liquid crystal phases. We investigated their phase transitions and superstructures by pol...
Structures of Liquid Crystalline Molecules and Their Properties : Molecular Shapes and Their Molecular Aggregates in Liquid Crystal Phases
KISHIKAWA Keiki
液晶 : 日本液晶学会誌 = Ekisho   25 Jan 2012   
PB19 Stabilization of blue phases by spatial arrangement of chiral mesogens
Kishikawa Keiki, Watanabe Tomohiro, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2012   
To investigate the influence of molecular structure of dopants for stabilization of blue phases, we prepared dopant compounds which had different spatial arrangements of chiral mesogens, and they were added to 5CB, respectively. The mixture of 5CB...
PB17 Stability and responsivity of ferroelectric columnar LC ureas
Kishikawa Keiki, Sato Kitaru, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2012   
In order to realize ferroelectric columnar mesophases, we synthesized LC urea-derivatives. The compounds exhibited hexagonal columnar and rectangular columnar LC phases. We investigated their phase transitions and superstructures by polarized opti...
PB16 Stabilization of ferroelectricity in liquid crystalline ureas by introducing aromatic groups to the peripheral parts of the columns
Kishikawa Keiki, Ohtsubo Ryoichi, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2012   
For achieving realization of ferroelectric columnar mesophase, we synthesized liquid crystalline urea-compounds. The compounds exhibited rectangular columnar and smectic A liquid crystal phases. We investigated their mesophases and structures by p...
PB14 Construction of chiral mesophases from achiral benzoic acid derivatives
Kohmoto Shigeo, Nayuki Ryo, Takahashi Masahiro, Kishikawa Keiki
Proceedings of Japanese Liquid Crystal Society Annual meeting   2012   
Chiral propeller-patterned textures were generated spontaneously from achiral benzoic acid derivatives possessing diethyleneoxide tails. In order to investigate the origins of spontaneous chiral induction, we prepared several types of benzoic acid...
PA18 Generation of blue phases by addition of chiral dopant molecules possessing two rod-like units in twisted parallel
Kishikawa Keiki, Sugiyama Takaaki, Takahashi Masahiro, Kohmoto Shigeo
Proceedings of Japanese Liquid Crystal Society Annual meeting   2012   
We synthesized novel tartaric acid derivatives possessing two rod-like units in twisted parallel. We investigated their helical twisting powers (HTP). Nematic liquid crystals doped with the dopants indicated high HTPs, and exhibited stable blue ph...
PA17 Zwitterionic liquid crystalline compounds for construction of lithium ion containing ionic liquid crystals
Kohmoto Shigeo, Rui Pan, Kishikawa Keiki
Proceedings of Japanese Liquid Crystal Society Annual meeting   2012   
Novel zwitterionic liquid crystalline compounds possessing imidazolium or ammonium as a cationic part and carboxylate as a counter ion were synthesized. Their phase transition behaviors and also the effect of the addition of lithium salts was exam...
PA16 Supramolecular liquid crystals generated by assembling of stilbene derivatives possessing carboxy groups
Kohmoto Shigeo, Watanabe Ippei, Takahashi Masahiro, Kishikawa Keiki
Proceedings of Japanese Liquid Crystal Society Annual meeting   2012   
Supramolecularly assembled discotic liquid crystals were prepared from isophtahlic acid derivatives substituted with 3,4,5-tridodecyloxystyryl group via intermolecular hydrogen bonding between carboxys. The compounds exhibited columnar liquid crys...
PA15 Pyridyl imidazolium salts as a versatile hydrogen bond acceptor for supramoleculary assembled ionic liquid crystal
Kohmoto Shigeo, Hareyama Kazunao, Takahashi Masahiro, Kishikawa Keiki
Proceedings of Japanese Liquid Crystal Society Annual meeting   2012   
Ionic liquids 1 possessing imidazolium and pyridine moieties were synthesized. These two moieties could act as an ionic core and a hydrogen bonding acceptor, respectively. Carboxylic acids 2-7 were used as hydrogen bonding donors. The complexes wi...
Report on 2011 Liquid Crystal Summer School
KISHIKAWA Keiki
Journal of the Japanese Liquid Crystal Society   25 Oct 2011   
Report on Japanese Liquid Crystal Conference 2010
KISHIKAWA Keiki
液晶 : 日本液晶学会誌 = Ekisho   25 Jan 2011   
Construction of Superstructures in Liquid Crystalline Molecular Aggregates Using Lateral Intermolecular Interactions
KISHIKAWA Keiki
Journal of Synthetic Organic Chemistry, Japan   1 Apr 2008   
Introduction of lateral intermolecular interactions (dipole-dipole interactions, hydrogen bonds, and perfluoroarene-arene interactions) are attempted in rodlike and half-disklike molecules. In the cases of dicyanothiophenes, introduction of long c...
Reports from universities and institutions: Kohmoto & Kishikawa Lab at Chiba
岸川 圭希
Journal of the Japanese Liquid Crystal Society   2007   
Recent Developments of Discotic Liquid Crystals : Switchable Polar Columnar Phases
TAKEZOE Hideo, KISHIKAWA Keiki
Journal of the Japanese Liquid Crystal Society   25 Apr 2006   
Novel superstructure and properties of achiral liquid crystalline molecules.
KISHIKAWA Keiki
Journal of the Japanese Liquid Crystal Society   25 Jan 2006   
PB32 Nano-fabrication of a tubular super structure using molecular self-assembly in a liquid crystal phase
Kishikawa Keiki, Kanno Yuta, Tanaka Seiji, Kohmoto Shigeo
日本液晶学会討論会講演予稿集   5 Sep 2005   
PB10 Superstructures of amphiphilic compounds consisting of biphenyl cores, alkyl chains and hydrophilic tri (ethylene glycol) chain
Katoh Masaki, Tanaka Seiji, Kohmoto Shigeo, Kishikawa Keiki
日本液晶学会討論会講演予稿集   5 Sep 2005   
PA25 Switching Dynamics of Polar Culumns in an Achiral Columnar Liquid Crystal with Intermolecular Hydrogen Bonding
Matsumoto Shohei, Okada Yoshinori, Takanishi Yoichi, Ishikawa Ken, Takezoe Hideo, Nakahara Shoichiro, Kishikawa Keiki
日本液晶学会討論会講演予稿集   5 Sep 2005   
2D02 Evaluation of Polar Structure in an Achiral Columnar Liquid Crystalline Urea by means of Second-Harmonic Generation
Okada Yoshinori, Matsumoto Shohei, Takanishi Yoichi, Ishikawa Ken, Nakahara Shoichiro, Kishikawa Keiki, Takezoe Hideo
日本液晶学会討論会講演予稿集   5 Sep 2005   
2B01 Self-Assemblies of Novel Liquid Crystalline Ureas and Their Polar Switching
Kishikawa Keiki, Nakahara Shoichiro, Tanaka Seiji, Kohmoto Shigeo, Okada Yoshinori, Matsumoto Shohei, Takanishi Yoichi, Ishikawa Ken, Takezoe Hideo
日本液晶学会討論会講演予稿集   5 Sep 2005   
1B06 Liquid crystal molecules with hydrogen bondings in the direction of their short axes
Kohmoto Shigeo, Someya Yasunobu, Tanaka Seiji, Kishikawa Keiki
日本液晶学会討論会講演予稿集   5 Sep 2005   
The rodlike molecules, 4-alkoxy-3, 5-bis (hydroxymethyl) benzoic acids, possessing two hydrogen bonding sites in the direction of short axes were synthesized and their thermal transition behavior was investigated. These molecules showed smectic li...
Photonic Effects in Anisotropic Soft Matter : Frontier of "Light"-"Liquid Crystal" Interactions
KISHIKAWA Keiki
液晶 : 日本液晶学会誌 = Ekisho   25 Apr 2004   
PB20 Synthesis of Novel Ionic Supramolecular Liquid Crystalline Compounds and Investigation of Their Molecular Aggregations
Kishikawa Keiki, Oda Katsuyuki, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2003   
Novel ionic supramolecular liquid crystalline compounds were synthesized by complexation of linear diamino-compounds and 3, 4, 5-trialkoxycinnamic acids. Their properties were investigated by polarized light optical microscopy, DSC, and single-cry...
PB19 Highly ordered liquid crystal phases by intermolecular hydrogen bonding
Kajitani Takashi, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto, Kishikawa Keiki
Proceedings of Japanese Liquid Crystal Society Annual meeting   2003   
Rod-like liquid crystalline compounds 1 possessing an amide group and a m-substituted alkoxy chain were synthesized and their thermodynamic behaviors and organizations were investigated. Compounds 1a (R^1 = R^2 = n-C_4H_9) and 1c (R^1 = n-C_4H_9, ...
PB23 Smectic phases which have plural inconstant layer distances
Kajitani Takashi, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto, Kishikawa Keiki
Proceedings of Japanese Liquid Crystal Society Annual meeting   2002   
Properties of liquid crystalline compounds, which have a strong intermolecular interaction originated from synparallel arrangement of the two mesogenic cores, were investigated by polarized light optical microscopy and DSC, and the layer distances...
PB20 Highly ordered liquid crystal phases by intermolecular hydrogen bonding
Kishikawa Keiki, Sakai Hideaki, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2002   
We prepared novel liquid crystalline compounds which have an amide group in the mesogen and a m-substituted alkoxy chain. These compounds were expected to have highly orderd liquid crystal phases by the intermolecular hydrogen bonding. We investig...
PB19 Novel liquid crystalline compounds possessing a strong dipole at its center
Kishikawa Keiki, Muramatsu Naoki, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2002   
We designed and synthesized a long bent-rod molecule 1-3 as a dopant to induce smectic C_A phases, and investigated the layer structures and properties by polarized light microscopy, differential scanning calorimetry, X-ray diffraction, and applyi...
PB10 Synthesis of novel liquid crystalline supramolecular polycatenars
Kishikawa Keiki, Igawa Naru, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2002   
A new supramolecule consisting of 3, 4, 5-trialkoxycinnamic acid and a core molecule was synthesized and their mesogenic behavior was investigated by polarized-light optical microscopy and X-ray diffraction. Some of them exhibited a columnar mesop...
PB06 Synthesis of Liquid Crystalline Cyclodextrin Derivatives
Kishikawa Keiki, Katoh Masaki, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2002   
The Primary hydroxyl groups of cyclodextrins were only benzoylated to give liquid crystalline cyclodextrins. It was expected that they dimerize and form molecular capsules, because of the intermolecular hydrogen bonding by their secondary hydroxyl...
Synthesis and Properties of Novel Liquid Crystalline Compounds, 3,4,5-Trialkoxybenzoic Anhydride
Kishikawa Keiki, Furusawa Shigetaka, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2001   
Novel liquid crystalline compounds, 3,4,5-trialkoxybenzoic anhydrides 1 were synthesized and the properties were investigated. Behaviors of 1 (R = n-C_6H_<13>, n-C_8H_<17>, n-C<10>H<21>, n-C<12>H<25>, n-C<14>H<29> and (S)-3,7-dimethyloctyl, (R)-3,...
Novel liquid crystalline compounds possessing a strong dipole at its center
Kishikawa Keiki, Muramatsu Naoki, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2001   
We synthesized liquid crystalline compounds which have a bent rod structure and two trifluoromethyl groups at its central carbon atom. The behaivors and properties were investigated by polarized light microscopy, DSC and powder X-ray diffraction. ...
Smectic pahses which have plural layer distances
Kishikawa Keiki, Kurosaki Takashi, Miwa Yuichi, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2001   
Behaviors and organization of liquid crystalline compounds which have an iminodicarbonyl moiety as the central junction of two mesogenic units in parallel, were investigated by polarized light optical microscopy, differential scanning calorimetry ...
Introduction of an Asymmetric Carbon in Liquid Crystalline Compounds Consisting of Two Mesogens in Twisted Parallel (2)
Kishikawa Keiki, Kato Masaki, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2001   
Two mesogens were connected with iminodicarbonyl (O=C-N(R)-C=O) moiety to generate a twisted arrangement of the two mesogens. We introduced an asymmetric carbon to α-position of the N-alkyl group to control chirality of the twisted arrangement. Ra...
Introduction of an Asymmetric Carbon in Liquid Crystalline Compounds Consisting of Two Mesogens in Twisted Parallel (1)
Kishikawa Keiki, Igawa Naru, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2001   
Synthesis and properties of a dimeric liquid crystalline compound which has an asymmetric carbon. Recently we have reported synthesis of a liquid crystalline compound consisting of two mesogens in twisted parallel. This time we introduced an asymm...
Synthesis and Properties of Novel Liquid Crystalline Compounds, 3,4,5-Trialkoxybenzoic Anhydride
Kishikawa Keiki, Furusawa Shigetaka, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2000   
Novel liquid crystalline compounds, 3,4,5-trialkoxybenzoic acid anhydrides 1 were synthesized and the properties were investigated. The half-disk molecule 1 has two carbonyl groups which are in syn-parallel. In the process of organization of the c...
Liquid Crystalline Compounds Consisting of Two Mesogens in Twisted Parallel (2)
Kishikawa Keiki, Miwa Yuichi, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2000   
Two mesogens were connected with O=C-N(R)-C-O to give a twisted arrangement of the mesogens because of the electrostatic repulsion between the two carbonyl-oxygen atoms. In this structure, the excluded volume effect must become the minimum to give...
Liquid Crystalline Compounds Consisting of Two Mesogens in Twisted Parallel (1)
Kishikawa Keiki, Kurosaki Takashi, Tanaka Seiji, Kohmoto Shigeo, Yamamoto Makoto
Proceedings of Japanese Liquid Crystal Society Annual meeting   2000   
Behaviors and organization of liquid crystalline compounds, N, N-bis{4-[4-(4-alkoxybenzoyloxy) benzoyloxylbenzoyl}alkylamine (1), which have an iminodicarbonyl moiety as the central junction and consist of two mesogenic units in twisted parallel, ...
Regio- and Stereoselective Intramolecular Epoxide Cyclizations
Makoto Yamamoto, Makoto Yoshitake, Keiki Kishikawa, Shigeo Kohmoto
Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry   1 Jan 1992   
Recent studies on intramolecular epoxide cyclizations were reviewed. Regio- and stereoselective anionic cyclization of epoxy-nitriles, -olefins, -carbamates and -alcohols were discussed. Also regio- and stereoselective Lewis acid promoted epoxide ...