Transient absorption and two-step laser excitation fluorescence spectra of the excited-state and ground-state proton transfer in 7-hydroxyquinoline
Transient absorption and two-step laser excitation fluorescence spectra of the excited-state and ground-state proton transfer in 7-hydroxyquinoline
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7-羟基喹啉激发态和基态质子转移的瞬态吸收和两步激光激发荧光光谱
DOI：
10.1021/ja00352a047
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
K. Tokumura
中科院分区：
文献类型：
--
作者：
M. Itoh;T. Adachi;K. Tokumura
已知6-和7-羟基喹啉(6-和7-HQ)的环氮在激发态比基态更碱性，而酚基更酸性。然后，在6-和7-HQ中，报道了激发态质子从中性形式(N*)转移到互变构体(T*，或两性离子形式)。1最近，Thilethwaite和Corkill 2报道了7-HQ甲醇溶液中激发态质子转移的纳秒和皮秒荧光研究。他们提出了一种质子转移的机制，包括通过上振动S3态的转移。然而，瞬时吸收研究可能为我们提供关于基态互变构体(T)的存在和基态(T-*)中质子转移的有价值的信息。
The ring nitrogen of 6-and 7-hydroxyquinoline (6-and 7-HQ) is known to be more basic and the phenolic group more acidic in the excited state than in the ground state. Then, the excited-state proton transferfrom the neutralform (N*) to the tautomer (T*, or zwitterion form) was reported in 6-and 7-HQ. 1 Recently, Thistlethwaite and Corkill2 reported the nano- and picosecond fluorescnece study of the excited-state proton transfer in a methanol solution of 7-HQ. They suggested a mechanism of the proton transfer including that via the upper vibrational S3 state. However, the transient absorption study that may provide us with valuable information on the existence of the ground-state tautomer (T) and on the proton transfer in the ground state (T—*