Phase Transition of Cholesteryl Fluoroalkanoates

Shinlchi Yano Department of Synthetic Chemistry, Gifu University, Yanagido, Gifu, 507–11, Japan

Nobuyuki Matsumoto Department of Synthetic Chemistry, Gifu University, Yanagido, Gifu, 507–11, Japan

Koichlro Aoki Department of Synthetic Chemistry, Gifu University, Yanagido, Gifu, 507–11, Japan

Naotake Nakamura Department of Synthetic Chemistry, Gifu University, Yanagido, Gifu, 507–11, Japan

Abstract

Phase transitions were studied by differential scanning calorimetry and polarized microscopy for various cholesteryl fluoroalkanoates; cholesteryl ω-monohydrofluoroal-kanoates (CHFA) [C₂₇H₄₅OCO(CF₂) _n CF₂H, n = 1, 3, 5 and 7] and cholesteryl perfluo-roalkanoates (CPFA) [C₂₇H₄₅OCO(CF₂) _m CF₃, m = 1 and 6]. There were observed one mesophase in n = 7 of CHFA and two mesophases in m = 6 of CPFA monotropically on cooling, but no mesophase in the other samples. The crystal structures were also determined for a homologous series of CHFA. The crystal form was monoclinic in all samples except of CHFA of n = 3, but the lattice constant exhibited a complicated change with increasing length of the ester, n.

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Phase Transition of Cholesteryl Fluoroalkanoates

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