Journal of Physical Chemistry p. 3184 - 3188 (1982)
Update date:2022-08-16
Topics:
Inoue, Haruo
Hida, Mitsuhiko
Nakashima, Nobuaki
Yoshihara, Keitaro
Radiationless deactivations from the S1(1CT) states of seven 1- and 2-substituted aminoanthraquinones were investigated by measuring picosecond fluorescence lifetimes and fluorescence quantum yields in benzene, acetonitrile, and ethanol.The S1(1CT) states of all derivatives were largely deactivated in ethanol.Deuterium isotope effects of the solvents on the nonradiative rate constants knr(in EtOH)/knr(in EtOD) = 9.0 (1-NH2 (2)), 2.1 (2-NH2 (5)), and 1.7 (2-piperidino (7)) were observed.The fluorescence quantum yield in ethanol was not affected by temperature (278-343 K).In benzene the excited 1-aminoanthraquinones were deacvated faster than 2-aminoanthraquinones.These observations were interpreted in terms of the radiationless deactivations od S1(1CT) through the intra- and intermolecular hydrogen bonds.
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