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Columnar liquid‐crystalline assemblies composed of spiropyran derivatives and sulfonic acids
Author(s) -
Tan BoonHooi,
Yoshio Masafumi,
Watanabe Kazuki,
Hamasaki Atsushi,
Ohno Hiroyuki,
Kato Takashi
Publication year - 2008
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1201
Subject(s) - spiropyran , sulfonic acid , alkyl , ionic liquid , materials science , derivative (finance) , ionic bonding , side chain , polymer chemistry , organic chemistry , chemistry , molecule , polymer , ion , catalysis , financial economics , economics
A series of fan‐shaped spiropyran derivatives with different length of alkyl chains has been synthesized. Liquid‐crystalline (LC) assemblies of spiropyran derivatives have been formed by the addition of organic sulfonic acids such as trifluoromethylsulfonic acid, 10‐camphorsulfonic acid, 4‐methylbenzenesulfonic acid, and imidazolium‐based ionic liquids (ILs) having a sulfonic acid group. Equimolar mixtures of a fan‐shaped spiropyran derivative with the acidic imidazolium‐based ILs exhibit columnar phases with wider LC temperature ranges as compared to those of other mixtures. The ionic interactions formed by the ionic imidazolium moieties should contribute to the stabilization of the columnar phases. On the other hand, equimolar mixtures of the spiropyran derivative with decane‐1‐sulfonic acid having a long alkyl chain and poly(4‐styrenesulfonic acid) do not show mesomorphism. The chemical structure of organic sulfonic acids is a key factor for the induction and stabilization of the LC phases. Copyright © 2008 John Wiley & Sons, Ltd.