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A Fourier transform electron paramagnetic resonance study of a photo-induced electron transfer reaction
Abstract
An investigation is made of the usefulness of Fourier-Transform Electron Paramagnetic Resonance (FT-EPR) for time resolved studies of photo-induced electron transfer. The reaction chosen for study is electron transfer from triplet zinc meso-tetraphenylporphine to p-benzoquinone in ethanol and from zinc tetrasodium-meso-tetra(4-sulfonatophenyl)porphine to p-benzoquinone in ethanol-water mixtures. The rate constant for this reaction is determined along with the spin-lattice relaxation times of the photoexcited porphyrin triplet and the doublet quinone anion radical. In addition, values are obtained for the relative magnitudes of the spin polarization created by the triplet and radical pair mechanism of Chemically Induced Dynamic Electron Polarization (CIDEP) to the anion radical EPR signal. The effect of changes in acceptor concentration and of changes in solvent composition on the values of these parameters is examined.
Subject Area
Physical chemistry|Chemistry
Recommended Citation
Ebersole, Marie Helen, "A Fourier transform electron paramagnetic resonance study of a photo-induced electron transfer reaction" (1992). Doctoral Dissertations Available from Proquest. AAI9219426.
https://scholarworks.umass.edu/dissertations/AAI9219426