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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Hydrogen-Bond Dynamics in the Excited State of Coumarin 102-Aniline Hydrogen-Bonded Complex
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Hydrogen-Bond Dynamics in the Excited State of Coumarin 102-Aniline Hydrogen-Bonded Complex

机译：香豆素102-苯胺氢键结合态激发态的氢键动力学

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摘要

Comparison of the steady-state FTIR absorption spectra of coumarin-102 (C-102) in tetrachloroethylene with added aniline of various concentrations, in neat aniline and in neat N,N-dimethylaniline (DMA), indicates formation of a hydrogen-bonded complex between C-102 and aniline in solution. Subpicosecond time-resolved infrared absorption spectroscopy has been applied to study the dynamics of the hydrogen-bond following photoexcitation of C-102 chromophore in a C-102-aniline hydrogen-bonded complex. Upon photoexcitation at 400 nm, the hydrogen bond between C-102 and aniline breaks within 250 fs. Reformation of hydrogen-bond between the excited C-102 molecule and aniline takes place within about 30 ps. Biexponential temporal dynamics monitored at C=O stretching vibration (1736-1742 cm~(-1)) in neat aniline, which is a strongly structured solvent due to formation of intermolecular hydrogen bonds, reveals the biphasic solvation dynamics of aniline with solvation times 0.6 and 7.2 ps. These time constants have been assigned to nondiffusive and diffusive structural reorganization of the solvent.
机译：在纯苯胺和纯N，N-二甲基苯胺（DMA）中，在添加了不同浓度苯胺的四氯乙烯中，香豆素102（C-102）的稳态FTIR吸收光谱的比较表明形成了氢键配合物在C-102和苯胺溶液之间亚皮秒时间分辨红外吸收光谱已用于研究在C-102-苯胺氢键复合物中C-102生色团被光激发后氢键的动力学。在400 nm处进行光激发后，C-102和苯胺之间的氢键在250 fs内断裂。激发的C-102分子和苯胺之间的氢键重整发生在大约30 ps之内。在C = O拉伸振动（1736-1742 cm〜（-1））的纯苯胺（由于形成分子间氢键而形成的一种强结构溶剂）中监测的双指数时空动力学揭示了苯胺在溶剂化时间为0.6时的双相溶剂化动力学和7.2 ps。这些时间常数已分配给溶剂的非扩散性和扩散性结构重组。

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