Design and Synthesis of Linear and Bow Shaped Ferroelectric Liquid Crystal Isomers Derived From L-Tyrosine

Abstract

A novel series comprising of two distinct ferroelectric liquid crystalline structural isomers. viz., (S)-1,4-diphenylene bis(2-chloro-3-(4-dodecyloxyphenyl)- propionate) (DCDP-1) and (S)-1,3-diphenylene bis(2-chloro-3-(4-hydroxyphenyl)- propionate) (DCDP-2), have been synthesized and characterized by thermal microscopy (TM), differential scanning calorimetry (DSC), spontaneous polarisation (PS) and response times (τ). The preliminary studies on thermal and ferroelectric properties reveal that the isomers show altogether a different trend of thermal and phase behaviour. The thermal analyses (TM and DSC) suggest the existence of different phase variants. Further, the ferroelectric studies infer a different chiral behavior among DCDP-1 and DCDP-2 compounds wherein DCDP-2 showed a wide ferroelectric thermal range with high magnitudes of PS (three fold) and response times (two fold).