Yn. Murthy et al., MOLECULAR VIBRATION APPROACH TO POLARIZABILITIES OF METHYL CINNAMATE LIQUID-CRYSTAL COMPOUNDS, Acta Physica Polonica. A, 91(6), 1997, pp. 1069-1079
A new theoretical method of evaluating polarizabilities of liquid crys
tals is presented and applied to the liquid crystalline compounds, nam
ely n-alkyl-p-(4-ethoxy benzylidene amino)-alpha-methyl cinnamates, wh
ich exhibit smectic A and nematic phases. In tile present method, vibr
ational frequencies are used to evaluate force constants, mean amplitu
de of vibration and hence bond polarizabilities. From mean polarizabil
ities, polarizability anisotropies and mean diamagnetic susceptibiliti
es are also estimated. A dose agreement is found between the values es
timated from the present molecular vibration method and the reported d
ata, which confirms the applicability of this method to the liquid cry
stals exhibiting smectic A and nematic phases. In addition, the variat
ion of the order parameter with temperature is also studied.