STEADY-STATE AND TIME-RESOLVED FLUORESCENCE STUDIES OF THE KINETICS AND THERMODYNAMICS OF PHOTOINDUCED CHARGE-TRANSFER REACTION IN DICYANOBENZENE-TOLUENE EXCIPLEX

A study of the photokinetics of photoinduced charge-tranfer reaction o f electron-donor-acceptor system of 1,4-dicyanobenzene with toluene is reported. An analysis of the results of steady-state and transient me asurements of fluorescence of monomer and exciplex within the framewor k of two-state kinetic scheme has brought about a set of rate constant s and thermodynamic parameters pertinent to excited state equilibrium of the system. A position of excited state equilibrium can be relative ly easy shifted by changes of temperature (and polarity) of solvent an d this is due to sensitivity of thermal feedback dissociation of excip lex to temperature. The relevance of the results to more complicated p hotokinetic schemes of other weak electron-donor-acceptor systems is a lso discussed.