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首页> 美国政府科技报告 >Mechanisms of Photochemical Reactions in Solution. Lxv. Quenching of Excited Singlet States of Electron-Rich Aromatic Compounds by Methyl Chloroacetate
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Mechanisms of Photochemical Reactions in Solution. Lxv. Quenching of Excited Singlet States of Electron-Rich Aromatic Compounds by Methyl Chloroacetate

机译：溶液中光化学反应的机理。 LXV。用氯乙酸甲酯淬灭富电子芳香族化合物的激发单重态

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The fluorescence of several electron-rich aromatic compounds is quenched by methyl chloroacetate and related compounds containing an activated carbon-chlorine bond. There are no low-lying singlet states available in the quenchers for classical energy transfer. No evidence for ground state interactions was observed. Rate constants for fluorescence quenching of indole, 1,4-dimethoxy-benzene and N, N-diethylaniline were near that of diffusion. This phenomenon is visualized as involving an interaction between the excited state of the aromatic molecule and the quencher, forming a loosely bound exciplex. The binding energy of the exciplex is possibly of charge-transfer nature. The specificity associated with the requirement for an activated chlorine suggests that the carbon-chlorine bonds in the quenchers are involved in the internal conversion process. (Author)

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