1C09 分子間二重水素結合による超分子の形成と発現する液晶相の制御

概要

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Supramolecular self-assembly processes through molecular interactions such as hydrogen bonds have been shown to be useful to achieve architectures of liquid crystals. We report here a new family of supramolecular liquid crystals built through the formation of double hydrogen bonds between 2-aminopyridine and benzoic acid moieties. The complexes consisting of 2,6-bis(acylamino)-pyridines(mAPy: m:3〜 8) and 4-(alkoxy)benzoic acids (nOBA: n=12, 14, 16, 18) show monotropic mesomorphic behavior. These complexes show phase behavior which is not observed for the single components. The induction of smectic and discotic phases can be controlled by the length of the single alkoxy chain for these complexes. For example, the complex with m=6 and n=18 exhibits a sharp melting transition from crystalline to isotropic at 93℃ on heating. The enthalpy change of the melting is 88.8kJ/mol. Upon cooling, a discotic phase is observed from 92 to 80℃.
日本液晶学会の論文
1996-09-30