Detail of "4792-83-0"

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Refractive indexes and optical anisotropy of homologous liquid crystals

Refractive indexes and optical anisotropy of homologous liquid crystals. Hanson, E. G.; Shen, Y. R. (Dep.Chemicals with cas numbers 4792-83-0 and 2635-26-9 also play role. Phys., Univ. California, Berkeley, Calif., USA). Mol. Cryst. Liq. Cryst., 36(3-4), 193-207 (English) 1976. CODEN: MCLCA5. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) We have measured as functions of temp. the refractive indices and linear birefringence of seven homologous compds. of p,p'-di-n-alkoxy-azoxybenzenes in the nematic phase. Using the Vuks' model of local-field correction, we have deduced from our results both the microscopic and the macroscopic order parameters. The former agree well with those detd. by Pines (1974) from the NMR results. The variations of the various microscopic parameters with the increase of the alkyl chain length are discussed. Addn. of CH2 groups to the alkyl chain increases the av. polarizability much faster than the polarizability anisotropy. Contributions to the polarizability anisotropy from the core and from the alkyl chains respectively are found. .