Phase Transition Studies in Some 4-n-Alkyl-N-(4-n-Alkyloxy-Benzylidene)-Anilines

The results of phase transition investigations in two homologous series of 4-n-alkyl-N-(4-n-alkyloxy-benzylidene)-anilines, viz., 60. m and 70. m compounds using thermal microscopy, differential scanning calorimetry, density and refractive index measurements are reported. The nature of the order of various phase transitions and the pre-transitional effects in the fluctuation dominated non-linear regions in the vicinity of IN, IA and NA transitions are discussed in the light of the available data on other nO. m compounds.     

Anisotropic properties of two nematogenic compounds

The diamagnetic susceptibilities and optical polarizabilities of two materials that exhibit nematic liquid crystralline phases in the vicinity of room temperature are reported using a molecular vibration approach and a modified Lippincott δ function potential model. The diamagnetic susceptibilities calculated from polarizabilities are also reported.