Optical Study of Orientational Order Parameter in p-n-(Phenyl Benzylidene) -p-Alkyl and Alkyloxy Anilines

B.R. Rajeswari; P. Pardhasaradhi; M. Ramakrishna Nanachara Rao; P.V. Datta Prasad; D. Madhavi Latha; V.G.K.M. Pisipati

doi:10.4028/www.scientific.net/SSP.181-182.75

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HomeSolid State PhenomenaSolid State Phenomena Vols. 181-182Optical Study of Orientational Order Parameter in...

Optical Study of Orientational Order Parameter in p-n-(Phenyl Benzylidene) -p-Alkyl and Alkyloxy Anilines

Abstract:

The refractive indices measurements are carried out using a modified spectrometer connected with wedge shaped cell and also the direct measurement of birefringence,δn obtained from Newton’s rings method with an indigenous setup for the liquid crystalline compounds p-n-(phenyl benzylidene)-p-n-alkyl and alkyloxy anilines, PBnA and PBnOA compounds. The molecular polarizabilitiy anisotropy (α_|| - α_⊥) is calculated for these compounds from different methods such as Lippincott δ-function model, molecular vibration method, Haller’s extrapolation method and scaling methods respectively. Further, the estimation of the molecular polarizabilities α_e and α_o are done from the isotropic Vuks and anisotropic Neugebauer models. The order parameter directly calculated from ∆n employing the method developed by Kuczynski is compared with the order parameter estimated from the different models using molecular polarizabilities.

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Solid State Phenomena (Volumes 181-182)

Pages:

75-78

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.181-182.75

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Online since:

November 2011

Authors:

B.R. Rajeswari, P. Pardhasaradhi, M. Ramakrishna Nanachara Rao, P.V. Datta Prasad, D. Madhavi Latha, V.G.K.M. Pisipati

Keywords:

Molecular Polarizability Anisotropy, Orientational Order Parameter

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