The quenching of triplet Cm and tetracene fluorescence by phenols is strongly enhanced by added pyridines. that this is due to quenching by hydrogen-bonded phenol-base pairs is given by the close agreement equilibrium constants for hydrogen-bond formation derived from kinetic measurements and from spectroscopic data. The effect is attributed to a trimolecular transition state in which electron from the phenol to the excited molecule is concerted with proton movement from the incipient strongly phenol cation radical to the hydrogen-bonded base.
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Biczók et al. (1995) studied this question.