CONCERTED ELECTRON AND PROTON MOVEMENT IN QUENCHING OF TRIPLET C-60 AND TETRACENE FLUORESCENCE BY HYDROGEN-BONDED PHENOL-BASE PAIRS

Biczók, László and LINSCHITZ, H. (1995) CONCERTED ELECTRON AND PROTON MOVEMENT IN QUENCHING OF TRIPLET C-60 AND TETRACENE FLUORESCENCE BY HYDROGEN-BONDED PHENOL-BASE PAIRS. JOURNAL OF PHYSICAL CHEMISTRY US, 99 (7). pp. 1843-1845. ISSN 0022-3654

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Abstract

The quenching of triplet Cm and tetracene fluorescence by phenols is strongly enhanced by added pyridines. Evidence that this is due to quenching by hydrogen-bonded phenol-base pairs is given by the close agreement between equilibrium constants for hydrogen-bond formation derived from kinetic measurements and from independent spectroscopic data. The effect is attributed to a trimolecular transition state in which electron transfer from the phenol to the excited molecule is concerted with proton movement from the incipient strongly acidic phenol cation radical to the hydrogen-bonded base.

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