Orientational ordering from molecular polarizabilities and an odd-even effect in nCB homologous series

The molecular polarizabilities of the homologous series of cyano-alkyl-biphenyl (C _n H_2n+1.φφ.CN for n = 5 to 9) have been calculated using two different internal field models. From these values the orientational order parameters have been obtained. The orientational ordering exhibits an odd-even alteration along the series. The variations of different parameters with the increase of alkyl chain length are discussed. The relative stabilities of the alkyl-cyano-biphenyls are also discussed in terms of the molecular parameters.