Abstract

Time Dependent Fluorescence Shift (TDFS) of a polar compound (AMBO) dissolved in a sequence of polar (protic or aprotic) solvents has been studied. This compound (AMBO) is: shown on fig. 1. In the ground state, the solvent cage surrounding the polar compound has a well defined topology which minimizes the solute-solvent interactions. In the excited state, as shown on fig. 1, large change occurs (charge distribution, dipole moment). As a consequence, the solvent cage has to reorganize in order to minimize this new interaction. The TDFS reflects this change and particularly, its dynamics, related to the motion of the cage. The kinetic theory of TDFS has recently gained new interest {1,2} and our results provide a test of the validity of theoretical approach.

© 1986 Optical Society of America