Deactivation of excited 2-naphthylamine due to hydrogen bonding interaction with pyridines. Fluorescence and picosecond laser photolysis studies.
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概要
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The mechanism of the strong fluorescence quenching observed when two conjugated π-electron systems are directly connected by hydrogen bonding has been studied by means of transient absorption spectral measurements with ps as well as ns laser photolysis method and fluorescence measurement. The bimolecular rate constants of quenching of 2-naphthylamine fluorescence by pyridine and 4-cyanopyridine have been determined in various solvents. The bimolecular reaction rate of fluorescence quenching by pyridine is smaller than the diffusion controlled one in many cases and depends considerably upon the dipole moment and the ability of formation of hydrogen bonding chain of solvent. However, the quenching by 4-cyanopyridine is diffusion controlled in every solvent examined here. By means of ps laser photolysis method, the state formed by charge transfer from excited 2-naphthylamine to hydrogen bonded pyridine in the quenching process has been observed for the first time. The possibility of the hydrogen atom transfer due to the mechanism of charge transfer followed by proton transfer in hexane solution is also discussed.
- 公益社団法人 日本化学会の論文
著者
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Ikeda Noriaki
Department Of Chemistry College Of Humanities And Sciences Nihon University
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Mataga Noboru
Department Of Chemistry Faculty Of Engineering Science Osaka University
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Okada Tadashi
Department Of Chemistry Graduate School Of Engineering Science And Research Center For Materials Sci
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Ikeda Noriaki
Department of Chemistry, Faculty of Engineering Science, Osaka University
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