Ultrafast excited-state proton transfer dynamics of 1,8-dihydroxyanthraquinone (chrysazin) studied by femtosecond time-resolved fluorescence spectroscopy

被引：53
作者：
Arzhantsev, SY [1 ]
Takeuchi, S [1 ]
Tahara, T [1 ]
机构：
[1] Inst Mol Sci, Okazaki, Aichi 4448585, Japan
来源：
CHEMICAL PHYSICS LETTERS | 2000年 / 330卷 / 1-2期
基金：
日本学术振兴会;
关键词：
D O I：
10.1016/S0009-2614(00)01087-3
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Femtosecond time-resolved fluorescence intensities of 1,8-dihydroxyanthraquinone (chrysazin) in hexane have been measured at room temperature for a wide visible wavelength region (470-670 nm) by using the up-conversion method. Time-resolved fluorescence spectra were reconstructed after deconvolution taking account of the finite instrumental response. It was found that both the 'normal-form type' fluorescence and the 'tautomeric-form type' fluorescence appear almost instantaneously, which indicates that a barrierless excited-state proton transfer occurs within 50 fs reflecting delocalization of the excited-state wave function. A fluorescence spectral change was also observed in a few picosecond time scale, which was assigned to an additional proton translocation induced by the intramolecular vibrational relaxation. (C) 2000 Elsevier Science B.V. All rights reserved.
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页码：83 / 90
页数：8
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