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Liquid Crystalline Nano-Segregated Structures in Hydrogen-Bonded Complexes of Fluoroalkyl Substituted Benzoic Acids

Published online by Cambridge University Press:  15 March 2011

Etsushi Nishikawa ,
Jun Yamamoto  and
Hiroshi Yokoyama
Etsushi Nishikawa
Affiliation:
Japan Science and Technology Corporation, Yokoyama Nano-structured Liquid Crystal Project TRC, 5-9-9 Tokodai, Tsukuba, Ibaraki 300-2635, Japan
Jun Yamamoto
Affiliation:
Japan Science and Technology Corporation, Yokoyama Nano-structured Liquid Crystal Project TRC, 5-9-9 Tokodai, Tsukuba, Ibaraki 300-2635, Japan
Hiroshi Yokoyama
Affiliation:
Japan Science and Technology Corporation, Yokoyama Nano-structured Liquid Crystal Project TRC, 5-9-9 Tokodai, Tsukuba, Ibaraki 300-2635, Japan
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Abstract

Several new benzoic acid derivatives having perfluorinated substituents were synthesized and their hydrogen-bonded complexes with 4, 4’-dipyridyl were prepared. In these acid/base complexes the incompatibility between perfluoroalkyl moieties and hydrocarbon parts is large, which can lead to organize nano-segregation structures. We have found in one of such complexes, that has a long flexible fluorinated moiety, a thermotropic cubic phase with Ia3d symmetry formed by double gyroid of two interpenetrating jointed rod networks with an estimated cell parameter of 10.9 nm. Furthermore another complex with a branched long perfluoroalkyl terminal chain exhibits a first order smectic A to smectic C phase transition, which is confirmed with thermal analysis detecting a large enthalpy change of 5.3 kJxmol-1, X-ray scattering experiments revealing a tilt angle jump, and polarized optical microscopy observing a remarkable texture change at the phase transition temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 709: Symposium CC – Advances in Liquid Crystalline Materials and Technologies , 2001 , CC7.8.1
Copyright
Copyright © Materials Research Society 2002

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