Molecular Crystals and Liquid Crystals, Vol.515, 125-134, 2009
Synthesis and Characterization of Banana-Shaped Mesogens Derived From a Benzophenone Moiety
A homologous series of Schiff's bases consisting of a benzophenone moiety as the central core has been synthesized. Schiff's bases were prepared starting from benzophenone by a sequence of reactions, viz., nitration followed by reduction and heating the resulting diamino derivative with 4-formyl-3-hydroxyphenyl 4-(alkyloxy)benzoate. Higher homologues of this series exhibit mesomorphism, but the lower homologues do not seem to possess any liquid crystalline property. The B2 mesophase was characterized by DFT study for orientation of dipole moment. Dipolar interaction and intramolecular H-bonding (N-H) have been considered to discuss the origin of the B2 phase in this homologous series of benzophenone moiety derived systems.