Influence of Oxygen on Phase Behavior of N(p-n-Octyloxy Benzylidene)p-n-Alkoxy Anilines: A Comparative Study

Abstract

The N (p-n-octyloxy benzylidene) p-n-alkoxy anilines (8O.Om) compounds were synthesized, and the mesomorphic properties were characterized by using thermal microscopy (TM) and differential scanning calorimetry (DSC) for m ¼ 3 to 7. The nematic (N), smectic-C (S C ), and smectic-G (S G ) phases are the more commonly observed in these compounds. The smectic-A (S A ) and smectic-B (S B ) phases are observed only in the 8O.O5 compound. The influence of oxygen on phase behavior of the 8O.Om compounds is compared with the data available on nO.m compounds.

The Influence of Oxygen on Mesomorphic Behavior of Benzylidene Anilines—The Effect of End Chain

“…The compounds were prepared by condensation of the corresponding benzaldehyde (0.1 mol) and aniline (0.1 mol) on refluxing with absolute ethanol in the presence of a few drops of glacial acetic acid [9]. After refluxing the reactants for 4 h, the solvent was removed by distillation under reduced pressure and the pure compound was recrystallized from absolute ethanol at low temperature.…”

Molecular Order-Disorder Phenomenon of a Nematogen: A Computational Analysis

“…In these phases the order of the crystalline state is partly lost and a certain degree of mobility will be attained by the individual molecules. The quest of computational and experimental studies for elucidating the struture-phase stability relationship at the molecular level is the continuing theme of LC science [2,3]. At the molecular level, the phases of matter are basically determined by the interplay between molecular struture, intermolecular interaction [4], and molecular motions.…”