Estimation of Molecular Radius, Mr and Bayers Non-Linearity Parameter, B/A in PBnA Series

Thermal expansion coefficient, α estimated from density,  is utilized for the computation of thermodynamic parameters in case of phenylbenzylidene alkylanilines with alkyl chain varying from 4 to 10, 12, 14, 16 and 18. The thermodynamic parameters like, Beyer’s nonlinearity parameter, B/A, is estimated. The molecular radius, Mr is also computed from density for these compounds for which the data is available in literature. The results are discussed how these parameters vary with the temperature in a particular phase, in a liquid crystal molecule and in a homologous series. The molecular radius and Beyer’s nonlinearity parameter estimated using different expressions and their nature is discussed. The results are compared with the available data in literature of other compounds.