Abstract
Abstract Time-resolved CT (charge transfer) fluorescence spectra and the fluorescence rise and decay curves at various wavelengths of the CT fluorescence band have been measured for the 1,2,4,5-tetracyanobenzene (TCNB)–toluene system at various temperatures. The results and detailed studies of the effect of solvent polarity on the fluorescene wavenumbers have demonstrated that the relaxation process is due to the change of structure including the surrounding solvent molecules from the Franck–Condon (F.C.) state to the equilibrium (e.q.) state of the excited complex. This relaxation process causes a large Stokes shift of the CT fluorescence.
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