PHOTOOXIDATION AND ELECTRON‐TRANSFER PROCESSES IN FREE‐BASE TETRAPHENYLPORPHIN PROBED BY RESONANCE RAMAN SPECTROSCOPY
作者： G. S. S. Saini , N. K. Chaudhury , A. L. Verma
DOI: 10.1111/J.1751-1097.1992.TB08529.X
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摘要: Abstract We report here the resonance Raman studies of photooxidation free base tetraphenylporphin (H2TPP) in presence external electron acceptors such as CCl4 and chloranil under selective laser irradiation. From dependence on concentration acceptors, polarity solvents, excitation lines temperatures, we have inferred that a weak triplet exciplex formed between excited H2TPP acceptor non-polar solvents serves transient species light-induced intermolecular charge transfer from to is primary process involved photooxidation. Observation partial rigid matrix at low temperatures has been interpreted be due long-range quantum mechanical tunneling process. Almost complete observed soft donor molecules can attain favorable relative orientation separation for during state lifetime exciplex.
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