Chiral Recognition in Molecular and Macromolecular Pairs of Liquid Crystals of (2R, 3S)- and (2S, 3S)-2-Fluoro-3-methylpentyl-4'-(11-Vinyloxyundecanyloxy)biphenyl-4- carboxylate Diastereomers.

摘要

(2R, 3S)-2-Fluoro-3-methylpentyl 4'-(11-vinyloxyundecanyloxy)biphenyl-4- carboxylate (15) (2R 92%ee) and (2S, 3S)-2-fluoro-3-methylpentyl 4'-(11-vinyloxyundecanyloxy)biphenyl-4-carboxylate (16) (2S 96%ee) diastereomers and their corresponding homopolymers and copolymers with well defined molecular weight and narrow molecular weight distribution were synthesized and characterized. The phase behaviors of 15 and poly (15) are identical to those of 16 and poly(16) respectively. The phase behavior of the two diastereomeric polymers can be compared only by superimposing the dependence of their thermal transition temperatures as a function of molecular weight. Both monomers display enantiotropic S sub a, monotropic S sub c and crystalline phases, while the corresponding polymers exhibit enantiotropic S sub a, S sub c and S sub x (unidentified smectic) mesophases. The phase behavior of the binary mixtures of 15 with 16 and poly(15) with poly(16) shows that they are miscible and therefore isomorphic within all their mesophases and over the entire range of compositions.