Orientational Order in the Nematogenic Homologous Series Trans-4-Alkyl-1-(4-Cyanophenyl) Cyclohexane

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Journal Title, Volume, Page: 
Journal of Chemical Physics, 77 (5, Cop). pp. 2570-6
Year of Publication: 
1982
Authors: 
Abdoh, M. M. M.
Department of Physics, University of Mysore, Mysore 570 006, India
Current Affiliation: 
Department of Physics, Faculty of Science, An-Najah National University, Palestine
Shivaprakash, N. C.
Department of Physics, University of Mysore, Mysore 570 006, India
Shashidhara Prasad
Department of Physics, University of Mysore, Mysore 570 006, India
Preferred Abstract (Original): 

The temperature variation of refractive indices (n e ,n o ), birefringence (Δn), density (ρ), and order parameter of the homologous compounds t r a n s‐4‐alkyl (4‐cyanophenyl)‐cyclohexane are reported in the nematic and isotropic phases. The principal molecular polarizabilities (α eo) and the order parameters S have been evaluated using the anisotropic internal field model (Neugebauer’s approach). The theoretical estimations of the mean and principal molecular polarizabilities made by two different approaches, viz., the additivity rule of bond polarizability and the modified Lippincott‐δ‐function potential model are in close agreement with the values evaluated from the experimental studies.