Photochemical reactions of aromatic compunds. XXXI. Exciplex quenching by pyridine, methylated pyridines, and methylated imidazoles and termolecular interaction in the excited singlet state.

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概要

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• Pyridine, methylated pyridines, and methylated imidazoles quenched the exciplexes of aromatic nitrile–2,5-dimethylfuran or 2,5-dimethyl-2,4-hexadiene, and the rate constants for the exciplex quenching were obtained. The exciplex quenching by 2-methyl- and 2,6-dimethylpyridines was much less efficient than that by the other quenchers. The exciplex quenching was discussed in terms of the interaction of the n-orbital of the quenchers with the positive charge developed on the electron-donor side of the exciplexes. Curved Stern-Volmer plots were obtained in the quenching of aromatic nitrile fluorescence by 1-methylimidazole and/or 1,2-dimethylimidazole. On the basis of the kinetic results, the mechanism was discussed in terms of a termolecular interaction between excited singlet aromatic nitrile, the methylated imidazole as the π-donor, and the second one as the n-donor.

• 公益社団法人 日本化学会の論文

著者

• Majima Tetsuro

  The Institute Of Physical And Chemical Research (riken):(present Address) The Institute Of Scientifi

• SAKURAI Hiroshi

  The Institute of Scientific and Industrial Research, Osaka University

• Pac Chyongjin

  The Institute of Scientific and Industrial Research, Osaka University

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