Orientational Distribution Coefficients of Guest-Host Systems Determined by Different Methods

Abstract

Order parameters determined by different spectroscopic methods are not identical because they refer to different “pseudo” orientation axes if an orientational distribution function f=f (β, γ) holds. The angles between these axes and those referring to the system of principal axes of the orientational distribution coefficients g^o _ij33are determined by the molecular properties owing to the spectroscopic method used. This is shown by an analysis of the frequency and temperature dependence of a relative order parameter for testosterone propionate in cholesteryl chloride/cholesteryl laurate measured with ultraviolet absorption (UV) and circular dichroism (ACD) as an e xamp1e.