Abstract
It has been shown by means of laser flash photolysis at 355 nm that (1) hydrogen atom transfer (HT) from triplet naphthalene derivatives (produced by the triplet sensitization of benzophenone (BP)) to BP occurs via a triplet exciplex having a weak charge-transfer structure; (2) in the presence of protons, HT is enhanced in the naphthol-BP system via a protonated triplet exciplex whereas in the naphthylammonium ion-BP system, markedly reduced; (3) in the methoxynaphthalene-BP system, proton-induced electron transfer (ET) takes place via a protonated triplet exciplex, and (4) these triplet exciplexes have sandwich-like structures on the basis of experiments for intramolecular HT and ET of the methylene bridged compounds.
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