Pioneering and Developing Exciplex Chemistry. Part 1

Nonequilibrium Solvation of Excited Dipolar Solute, Its Relaxation Causing Fluorescence Stokes Shifts, and Mechanisms of Photoinduced Electron Transfer between Conjugate π-Electronic Systems Direcc

Abstract

Nonequilibrium solvation of excited solute molecules and its relaxation which play roles of crucial importance in the exciplex chemistry are discussed in relation to the mechanism of the fluorescence Stokes shift in polar solution originally given by the Lippert-Mataga equation and also in relation to the classical electron transfer (ET) theory by Marcus. Mechanisms of photoinduced ET which have been elucidated by femtosecond-picosecond laser photolysis studies on the hydrogen bonding (HB) systems in a nonpolar solvent are discussed as an extremely interesting example of ET induced by a specific coupling with a slight proton shift in HB.