Yasushi Yokoyama - My portal

Profile Information

Degree: Ph. D. (Science)(The University of Tokyo)

J-GLOBAL ID: 200901021817082950
researchmap Member ID: 5000051829

External link: http://www.researcherid.com/rid/C-8203-2013

Research Areas

Research History

Apr, 2001 - Present

Professor, Department of Advanced Materials Chemistry, Graduate School of Engineering, Yokohama National University
Apr, 1999 - Mar, 2001

Professor, Department of Materials Sciences and Chemical Engineering, Faculty of Engineering, Yokohama National University
Dec, 1991 - Mar, 1999

Associate Professor, Department of Materials Sciences and Chemical Engineering, Faculty of Engineering, Yokohama National University
Apr, 1985 - Nov, 1991

Research Associate, Department of Materials Sciences and Chemical Engineering, Faculty of Engineering, Yokohama National University
Apr, 1980 - Mar, 1985

Research Associate, Department of Materials Chemistry, Faculty of Engineering, Yokohama National University
Professor, Yokohama National University Faculty of Engineering Division of Materials Science and Chemical Engineering

Education

Committee Memberships

Oct, 2011 - Present

連携会員, 日本学術会議

Papers

Chirality and stereoselectivity in photochromic reactions

Tetsuya Nakagawa, Takashi Ubukata, Yasushi Yokoyama

Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 34 152-191, Mar 1, 2018 Peer-reviewedInvited
Rapid decoloration of photochromic 3H-naphthopyran attached to three-dimensional poly(dimethylsiloxane) network

Takashi Ubukata, Yasushi Ozawa, Masako Saito, Ken-Ichiro Hiwatari, Yasushi Yokoyama

Bulletin of the Chemical Society of Japan, 91(4) 563-570, 2018 Peer-reviewed
Photochromism of a spiro-functionalized diarylethene derivative: Multi-colour fluorescence modulation with a photon-quantitative photocyclization reactivity

Tetsuya Nakagawa, Yosuke Miyasaka, Yasushi Yokoyama

Chemical Communications, 54(26) 3207-3210, 2018 Peer-reviewed
Photochromism and the fluorescence properties of bisbenzothienylethene and: S, S, S ′, S ′-tetraoxide derivatives with dual conjugated fluorescent groups on their side chains

Katsuhiro Watanabe, Takashi Ubukata, Yasushi Yokoyama

Photochemical and Photobiological Sciences, 17(6) 711-717, 2018 Peer-reviewed
Photocyclization of photoswitches with high enantioselectivity in human serum albumin in an artificial environment

Koichi Kawamura, Ken Osawa, Yuta Watanobe, Yuri Saeki, Naoki Maruyama, Yasushi Yokoyama

CHEMICAL COMMUNICATIONS, 53(22) 3181-3184, Mar, 2017 Peer-reviewed
Gated Photochromic System of Diarylethene with a Photon-Working Key

Sadegh Mahvidi, Sakiko Takeuchi, Sara Kusumoto, Hiroyasu Sato, Tetsuya Nakagawa, Yasushi Yokoyama

ORGANIC LETTERS, 18(19) 5042-5045, Oct, 2016 Peer-reviewed
All-Optical Fine-Tuning of Absorption Band of Diarylethene with Photochromic Acid-Generating Spiropyran

Sara Kusumoto, Tetsuya Nakagawa, Yasushi Yokoyama

ADVANCED OPTICAL MATERIALS, 4(9) 1350-1353, Sep, 2016 Peer-reviewedInvited
Highly Sensitive Formation of Stable Surface Relief Structures in Bisanthracene Films with Spatially Patterned Photopolymerization

Takashi Ubukata, Megumi Nakayama, Taishi Sonoda, Yasushi Yokoyama, Hideyuki Kihara

ACS APPLIED MATERIALS & INTERFACES, 8(34) 21974-21978, Aug, 2016 Peer-reviewed
Synthesis and photochromic properties of 4,5-bisaryl-3(2H)-pyridazinones

Ersin Orhan, Leyla Gundogdu, Mahmut Kose, Yasushi Yokoyama

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 314(1) 164-170, Jan, 2016 Peer-reviewed
A photon-working on/off switch for intramolecular donor-acceptor interactions and invisible modulation of the fluorescence

Sakiko Takeuchi, Tetsuya Nakagawa, Yasushi Yokoyama

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, 15(3) 325-328, 2016 Peer-reviewed
Substituent effects on the photochromic properties of 3,3-diphenyspiro[benzofluorenopyran-cyclopentaphenanthrene]s

Junji Momoda, Shinobu Izumi, Yasushi Yokoyama

DYES AND PIGMENTS, 119 95-107, Aug, 2015 Peer-reviewed
Solubility control of organic acid-base salts by photochromism

Yasushi Yokoyama, Yuma Hiromoto, Kazuya Takagi, Katsuhiro Ishii, Stephanie Delbaere, Yuta Watanobe, Takashi Ubukata

DYES AND PIGMENTS, 114(1) 1-7, Mar, 2015 Peer-reviewed
Facile one-step photopatterning of polystyrene films

Takashi Ubukata, Yusuke Moriya, Yasushi Yokoyama

POLYMER JOURNAL, 44(9) 966-972, Sep, 2012 Peer-reviewed
Photo-triggered Surface Relief of Polystyrene Films—Highly Photo-sensitive Formation by the Addition of a Benzophenone Derivative

Takashi Ubukata, Shintaro Yamamoto, Yusuke Moriya, Shohei Fujii, Yasushi Yokoyama

25(5) 675 - 678, May, 2012 Peer-reviewed
Special Issue: ISOP2010 Foreword

Yasushi Yokoyama, B. Mark Heron, He Tian

DYES AND PIGMENTS, 92(2) 789-789, Feb, 2012 Peer-reviewed
Bisarylindenols: fixation of conformation leads to exceptional properties of photochromism based on 6 pi-electrocyclization

Hatsune Ogawa, Kazuya Takagi, Takashi Ubukata, Akiko Okamoto, Noriyuki Yonezawa, Stephanie Delbaere, Yasushi Yokoyama

CHEMICAL COMMUNICATIONS, 48(97) 11838-11840, 2012 Peer-reviewed
Phototriggered micromanufacturing using photoresponsive amorphous spirooxazine films

Takashi Ubukata, Shohei Fujii, Kento Arimatsu, Yasushi Yokoyama

J. Mater. Chem., 22(29) 14410 - 14417, 2012 Peer-reviewed
Dual-mode fluorescence switching of photochromic bisthiazolylcoumarin

Kazushi Suzuki, Takashi Ubukata, Yasushi Yokoyama

CHEMICAL COMMUNICATIONS, 48(5) 765-767, 2012 Peer-reviewed
A Unified Strategy for Exceptionally High Diastereoselectivity of Photochromism of Chiral Diarylethenes

Yasushi Yokoyama, Tatsuya Shiozawa, Yutaka Tani, Takashi Ubukata

Angew. Chem. Int. Ed. (Wiley), 48(25) 4521 - 4523, May, 2009 Peer-reviewed
Dendrimer diarylethenes: the memory effect of conformation in polymer matrices

Yuhei Fujimoto, Takashi Ubukata, Yasushi Yokoyama

CHEMICAL COMMUNICATIONS, 2008(44) 5755-5757, 2008 Peer-reviewed

Misc.

Fulgides for Memories and Switches

Chem. Rev., 100(5) 1717 - 1739, May, 2000

Books and Other Publications

Photon-Working Switches

Editors, Yasushi Yokoyama, Keitaro Nakatani (Role: Joint editor, One of the two editors.)

Springer Japan, Aug, 2017 (ISBN: 9784431565420)
化学便覧応用化学編第7版

西山豊, 横山泰 (Role: Joint editor, 第15章有機化学品)

丸善出版, Jan 30, 2014 (ISBN: 9784621097014)
機能性色素の科学

横山泰 (Role: Joint author, 第14章フォトクロミック色素)

化学同人, 2013 (ISBN: 9784759814156)
New Frontiers in Photochromism

Masashiro Irie, Yasushi Yokoyama, Takahiro Seki (Role: Joint editor, Chapter 8 High Performance Thermally Irreversible Photochromism based on 6pi-Electrocyclization)

Springer Verlag, 2013 (ISBN: 9784431542902)
Photochromism

Y. Yokoyama, M. Irie, K. Matsuda, K. Uchida, T. Tsujioka, T. Seki, A. Shishido, M. Kinoshita, J. Abe, K. Sumaru, J. Momoda (Role: Joint author)

Kyoritsu Shuppan Co., Ltd., May 10, 2012
Molecular Switches, Second Edition

Yasushi Yokoyama, Tsuyoshi Gushiken, Takashi Ubukata (Role: Joint author, Chapter 3)

Wiley VCH, 2011 (ISBN: 9783527313655)
Analysis of Spectra of Organic Materials with Practise

(Role: Joint author)

Tokyo Kagaku Dojin, Mar 15, 2010 (ISBN: 9784807907250)
マテリアルサイエンス有機化学

伊与田正彦, 横山泰, 西長亨 (Role: Joint author)

東京化学同人, 2007 (ISBN: 9784807906147)
”キラルフォトクロミック分子の新展開”，「新規クロミック材料の設計・機能・応用」，関隆広監修，第5章

谷泰 (Role: Joint author)

シーエムシー, 2005
Chirality in Photochromism, in "Chiral Photochemistry," Ed by Y. Inoue and V. Ramamurthy, Chapter 6

(Role: Joint author)

Marcel Dekker, 2004
The Chemical Society of Japan - A 125-Year Quest for Excellence

(Role: Joint author)

The Chemical Society of Japan, 2003
Fulgides and Related Systems in "CRC Handbook of Photochemistry and Photobiology," 2nd ed. Ed by W. Horspool, Chapter 86

(Role: Joint author)

CRC Press, Inc., 2003
”フォトンモード光記録材料”「有機エレクトロニクス・フォトニクス材料とデバイス」長村利彦監修，第2章2-1

(Role: Joint author)

シーエムシー, 2003
「ブルーバックス：化学・意表を突かれる身近な疑問

渡辺正, 桐村光太郎, 溝部裕司, 庄一志 (Role: Joint author)

講談社（ブルーバックス）日本化学会編, Jul, 2001
Molecular Switches with Photochromic Fulgides, in "Molecular Switches," ed by B. L. Feringa, Chapter 4

(Role: Joint author)

Wiley-VCH, Jun, 2001

Teaching Experience

Research Projects

Creation of Molecularly Integrated Multi-responsive Photochromic Materials

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research on Innovative Areas, Ministry of Education, Culture, Sports, Science and Technology, Jun, 2014 - Mar, 2019

Yasushi Yokoyama
立体配座制御に基づく高性能フォトクロミック化合物の創製

科学研究費助成事業, 基盤研究(B), 日本学術振興会, Apr, 2011 - Mar, 2015

横山泰
フォトクロミズムと酸塩基反応の協同効果による溶解性の制御

科学研究費助成事業, 萌芽研究, 萌芽研究, Apr, 2011 - Mar, 2013

横山泰
電子環状反応に基づくステルスフォトクロミズム

科学研究費助成事業, 特定領域研究, 文部科学省, Sep, 2007 - Mar, 2011

横山泰
分子繭：固体媒体中におけるフォトクロミック分子の光反応性の確保

科学研究費助成事業, 萌芽研究, 萌芽研究, Apr, 2007 - Mar, 2009

横山泰
超高密度光記録システムに用いる不斉有機フォトクロミック色素の創生

科学研究費助成事業, 基盤研究(A), 日本学術振興会, Apr, 2004 - Mar, 2007

横山泰
可逆的に光応答する機能界面の構築

科学研究費助成事業, 特定領域研究, 文部科学省, Apr, 2003 - Mar, 2007

横山泰
固体表面で機能する有機フォトクロミック材料の創製

科学研究費助成事業, 特定領域研究, 文部科学省, Apr, 2002 - Mar, 2003

横山泰
フォトクロミズムにシンクロナイズしたキラル情報の可逆的制御

科学研究費助成事業, 特定領域研究, 文部科学省, Apr, 1999 - Mar, 2003

横山泰
超分子フォトクロミック系の構築

科学研究費助成事業, 基盤研究(C), 日本学術振興会, Apr, 1998 - Mar, 2000

横山泰
分子不斉をもつ有機フォトクロミック分子の合成と物性

科学研究費助成事業, 基盤研究(C), 日本学術振興会, Apr, 1996 - Mar, 1997

横山泰
熱安定性，繰り返し耐久性に優れたフォトクロミック化合物の合成

科学研究費助成事業, 基盤研究(C), 日本学術振興会, Apr, 1991 - Mar, 1993

横山泰
アリリック・ストレインを利用した立体選択的環状ハイドロボレーションの研究

科学研究費助成事業, 奨励研究, 日本学術振興会, Apr, 1988 - Mar, 1989

横山泰
ピネン類を原料とする光学活性テルペン類の合成

科学研究費助成事業, 奨励研究, 日本学術振興会, Apr, 1982 - Mar, 1983

横山泰