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 (P_S) 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 P_S (three fold) and response times (two fold).

Key Words:

• DCDP-1
• DCDP-2
• ferroelectric liquid crystal
• spontaneous polarisation