Abstract
Abstract Photoinduced electron transfer from Zn-tetraphenylporphyrin (ZnTPP) to benzoquinone (BQ) in micelles of cetyltrimethylammonium chloride (CTAC) has been investigated by time-resolved Fourier-Transform Electron Paramagnetic Resonance (FT-EPR). An analysis of the time-evolution of the FT-EPR signal from the BQ anion radical following laser excitation of ZnTPP gives the values of the forward and back electron transfer rate constants and for the BQ− spin-lattice relaxation time. The data are compared with those obtained from ZnTPP/BQ in ethanol. The experimental data show that the forward reaction involves electron transfer from CTAC solubilized ZnTPP to BQ in the aqueous phase. Furthermore, attraction between the cationic headgroups of the surfactant molecules and BQ− apparently promotes back electron transfer.
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