Liquid crystalline phase transition studies in N(p-n-butoxybenzylidene) p-n decylaniline, 40.10

The synthesis, characterization and the temperature dependence of density and ultrasonic velocity of N(p-n-Butoxybenzylidene) p-n-decylaniline, 40.10 are presented. The compound exhibits as trivariant liquid crystalline mesomorphism Viz., NAB the Isotropic – Nematic, and Smectic A – Smectic B phase transitions are found to be first order. However, the interesting Nematic Smectic A (NA) transition shows a second order nature. The NA transition results are discussed in the light of the available data on other nO.m compounds. The computed molecular parameters: adiabatic compressibility (β_ad) molar sound velocity (R_n) and molar compressibility (A_w) are presented.