Kinetic spectroscopy of orientational states of solvated dye molecules in polar solutions

Abstract

Some intermolecular processes, especially those due to a change of orientational structure of the medium surrounding a dye molecule in solution, are studied by means of kinetic spectroscopy. The first part of the paper is devoted to the question of inhomogenous orientational broadening of electronic transitions of dyes in polar solutions, in particular, the dynamic character of such broadening is demonstrated. Then we discuss the importance of inhomogeneous orientational broadening of dye spectra for the mechanism of directed energy transfer in rigid solutions including biological systems. Finally we try to show how the orientational relaxation, i.e. the temporal change of the spatial configuration of the solvate, influences the kinetics of the energy transfer between two different dyes in a mixed liquid solution.