The analysis of the electron transfer rate from steady-state fluorescence spectroscopy

The feasibility of obtaining the electron transfer rate from steady-state fluorescence spectroscopy was investigated. Polymeric films with a fixed concentration of an electron donor molecule were studied as a function of an electron acceptor concentration. The transfer studied was from tetraphenylporphyrin to duroquinone in a polystyrene matrix. The data were analyzed according to Perrin model and the critical radius for electron transfer obtained was 7.1 A. There was an attempt to obtain the electron transfer rate from the nearest-neighbor and Inokuti-Hirayama models, but the parameters that define the rate could not be unequivocally determined.