MISC

2016年8月

Influence of Counter Anions on Inclusion Complexation of p-Sulfonatocalix[6] arene with 1-Butyl-3-methylimidazolium Salts (Ionic Liquids)

ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS
  • Yusaku Honda
  • ,
  • Shono Fujitani
  • ,
  • Sho Tamaki
  • ,
  • Naoya Inazumi
  • ,
  • Tadashi Hanaya
  • ,
  • Yoshimi Sueishi

230
8
開始ページ
1153
終了ページ
1164
記述言語
英語
掲載種別
DOI
10.1515/zpch-2015-0611
出版者・発行元
WALTER DE GRUYTER GMBH

Using the inclusion complexation of methylene blue with p-sulfonatocalix[ 6] arene (Calix-S6) as a chemical indicator, the association constants of inclusion complexes of Calix-S6 with visible-spectroscopically inert 1-butyl-3-methylimidazolium salts (ionic liquids (IL): counter anions BF4-, PF6-, and Cl-) were determined. It was found that the experimentally observed association constants of IL with Calix-S6 in a water-methanol mixture increased in the order of counter anion Cl- < BF4- < PF6-. The F-19 NMR signals of counter anions BF4- and PF6- shift upfield upon addition of Calix-S6. From the F-19 NMR chemical shifts, we suggested that Calix-S6 forms weak 1 : 1 complexes with the BF4- and PF6- anions. The binding constants and their thermodynamic parameters for the complexation of the BF4- and PF6- anions with Calix-S6 were evaluated in a water-methanol mixture (6 : 4 (V/V)) at 298 K:K-A = 26.2M (-1) for BF4- and 106 M-1 for PF6 (-). Based on the results, the characteristics for the complexation of the counter anions with Calix-S6 were discussed and the inclusion constants of Calix-S6 with the cationic ringmoiety of 1-butyl-3-methyl-imidazolium salts were determined.

Web of Science ® 被引用回数 : 2

リンク情報
DOI
https://doi.org/10.1515/zpch-2015-0611
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000386485200005&DestApp=WOS_CPL

エクスポート
BibTeX RIS