1D14 分子間水素結合による超分子ネットワーク体の構築と液晶性の発現

概要

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Supramolecular liquid-crystalline networks have been built by intermolecular hydrogen bonds between multifunctional hydrogen bonding molecules. Tricarboxylic acids, 1,3,5-trisubstituted benzene having three benzoic acid moieties, and disubstituted benzoic acids with two benzoic acid moieties, have been synthesized for the use as tirfunctional H-bond donors. These trifunctional H-bond donors have been complexed with bifunctional and trifunctional H-bond acceptors, such as bipyridines and a tripyridine, maitaining the 1:1 donor/acceptor stoichiometry. Although all individual components are non-mesogenic, self-assembly of these multifunctional compounds results in the formation of liquid-crystalline network structures. For example, the H-bonded complex prepared from 1,3,5-tris(2-(2-(4-carboxyphenoxy)ethoxy)ethoxy)benzene and trans-1,2-bis(4-pyridyl)ethylene shows a smectic A phase from 176 to 156 ℃ on cooling. Forthermore, the mesophase-isotropic phase transition is reversibly observed for the complex. This behavior is attributed to the dynamics of the hydrogen bonds.
日本液晶学会の論文
1995-09-10