Abstract
The long-range orientational order of mesogenic 4-n-pentylphenylthio-4′-n-octyloxybenzoate () doped with a dichroic dye was studied by means of electronic absorption and fluorescence measurements. The order parameters ⟨P2 ⟩ and ⟨P4 ⟩ as well as the orientational distribution function were determined on the basis of absorption and emission spectra of linearly polarized light recorded as a function of temperature in the nematic, smectic A and smectic C phases. An influence of the dye molecular structure on the orientational order of the dye/liquid crystal mixture was observed. A correlation between the order parameter values and the phase transitions temperature shift due to the dye addition was found. § This article is dedicated to Prof. Jerzy A. Janik on his 80th birthday.
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