Mesomorphic Behavior of Compounds Incorporating One-Unit Linking Groups. II

Abstract

4,4′-Bis[4-(4-alkoxybenzylideneamino)benzoyloxy]diphenylmethanes bearing methoxy to decyoxy groups exhibit a smectic C phase. Compared with the behavior of the isomeric 4,4′-bis [4-(4-alkoxybenzoyloxy)benzylideneamino]diphenylmethane, the clearing point tends to be higher though falls more rapidly by the increase of the alkyl chain length and the melting point tends to be lower, resulting in the mesophase temperature range wider by a factor of two or more for most of the homologous members. 4,4′-Bis[4-(4-alkxoybenzoyloxy)benzylideneamino]diphenylamines are nematogenic and smectic A and B phases are additionally observed for the heptyloxy and octyloxy members.

Key Words:

• smectic
• nematic
• methylene linkage
• imino linkage