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学科主题: 物理化学
题名: Excited-state hydrogen bonding effect on dynamic fluorescence of coumarin 102 chromophore in solution: A time-resolved fluorescence and theoretical study
作者: Liu, Yu-Hui1, 2;  Li, Peng1
通讯作者: 李鹏
关键词: Hydrogen bond ;  Excited state ;  Time-resolved fluorescence ;  Equilibrium constant
刊名: JOURNAL OF LUMINESCENCE
发表日期: 2011-10-01
DOI: 10.1016/j.jlumin.2011.05.010
卷: 131, 期:10, 页:2116-2120
收录类别: SCI
文章类型: Article
部门归属: 11
项目归属: 1101
产权排名: 1,1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Optics
摘要: Excited-state hydrogen bonding effect on dynamic fluorescence of coumarin 102 chromophore in solution: A time-resolved fluorescence and theoretical study
研究领域[WOS]: Optics
英文摘要: The steady-state absorption and emission as well as the time-resolved fluorescence spectra of coumarin 102 (C102) in both aprotic and alcoholic solvents have been used to study the effect of excited-state hydrogen bond on the dynamic fluorescence of C102 chromophore in various solutions. The dual fluorescence of C102 in alcohols, which is dependent on the hydrogen-bonded donation ability of the solvent, has been assigned to the distribution of free C102 and a hydrogen-bonded complex. Furthermore, a shift of the fluorescence spectra induced by excited-state hydrogen bond has been demonstrated to take place within hundreds of picoseconds by the performance of the time-resolved fluorescence spectra with the time-correlated single-photon-counting (TCSPC) technique. Moreover, the time-dependent density functional theory (TDDFT) has been used to calculate the hydrogen-bonded equilibrium constant pK(HB) in different electronic states. It has been demonstrated for the first time that the hydrogen bond strengthening in electronic excited states could decrease the free energy of the hydrogen-bonded complex due to its stronger binding energy. Therefore, the hydrogen-bonded equilibrium will become markedly in favor of the hydrogen-bonded forms in electronic excited states by comparison with the case in the ground state. (C) 2011 Elsevier B.V. All rights reserved.
关键词[WOS]: INTRAMOLECULAR CHARGE-TRANSFER ;  HEPTAMETHINE CYANINE DYE ;  SITE-SPECIFIC SOLVATION ;  ELECTRON-TRANSFER ;  APROTIC-SOLVENTS ;  PROTON-TRANSFER ;  CYTOCHROME-C ;  LASER-DYES ;  TD-DFT ;  MECHANISM
语种: 英语
WOS记录号: WOS:000293118100016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115384
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Liu, Yu-Hui,Li, Peng. Excited-state hydrogen bonding effect on dynamic fluorescence of coumarin 102 chromophore in solution: A time-resolved fluorescence and theoretical study[J]. JOURNAL OF LUMINESCENCE,2011,131(10):2116-2120.
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