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Solvent Effects on Spectral Property and Dipole Moment of the Lowest Excited State of Coumarin 343 Dye
Li-lin Jiang,Wei-long Liu,Yun-fei Song,Xing He,Yang Wang,Hong-lin Wu,Yan-qiang Yang*
Author NameAffiliationE-mail
Li-lin Jiang Center for the Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, ChinaDepartment of Physics and Electronics Information Engineering, Hezhou University, Hezhou 542800, China  
Wei-long Liu Center for the Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China  
Yun-fei Song Center for the Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China  
Xing He Center for the Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China  
Yang Wang Center for the Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China  
Hong-lin Wu Center for the Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China  
Yan-qiang Yang* Center for the Condensed Matter Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, China yqyang@hit.edu.cn 
Abstract:
Steady-state absorption and fluorescence spectra, and time-resolved fluorescence spectra of coumarin 343 (C343) were measured in different solvents. The effect of the solvent on the spectral properties and dipole moment of the lowest excited state of C343 were investigated. It was found that the absorption and fluorescence spectra red-shifted slightly and strongly with increasing solvent polarity, respectively, because the charge distribution of the excited state leaded to the increasing difference between the absorption and fluorescence spectra with increasing solvent polarity. The dipole moment of the lowest excited state of C343 was determined from solvatochromic measurements and the quantum chemical calculation, and the results obtained from these two methods were fully consistent. Investigations of the time-resolved fluorescence of C343 in different solvents indicated that the fluorescence lifetimes increased nearly linearly with increasing solvent polarity from 3.09 ns in toluene to 4.45 ns in water. This can be ascribed to the intermolecular hydrogen bonding interactions between C343 and hydrogen donating solvents.
Key words:  Time-resolved fluorescence, Dipole moment, Solvent polarity function, Quan-tum chemical calculation, Intermolecular hydrogen bonding interaction
FundProject:
溶剂对香豆素343染料光谱性质和最低激发态偶极矩的影响
蒋礼林,刘伟龙,宋云飞,何兴,王阳,吴红琳,杨延强*
摘要:
通过对香豆素343(C343)在不同溶剂中的稳态吸收光谱、稳态荧光光谱和时间分辨荧光光谱的分析,研究了溶剂对C343的光谱性质的影响,并获得了光谱特性与溶剂极性之间的依赖关系. 吸收光谱峰值的红移随着溶剂极性的增加而发生较小的变化. 然而,荧光光谱的峰值对溶剂的极性却很敏感,并随着溶剂极性参数f(ε,n)的增加呈线性增长. 这是由于C343激发态电荷分布的变化导致了它在极性溶剂中第一激发单重态能级的变化. 用溶剂效应测量法和量子化学计算方法确定了C343最低激发态的偶极矩,这两方法所得的结果一致. C343在不同溶剂中的时间分辨荧光光谱研究表明荧光寿命随着溶剂极性的增加而增加,即从甲苯溶液的3.09 ns线性地增加到水溶液中4.45 ns;荧光寿命延长的根源可归因于C343与氢键给体溶剂之间的分子间氢键相互作用.
关键词:  时间分辨荧光,偶极矩,溶剂极性函数,量子化学计算,分子间氢键相互作用
DOI:10.1088/1674-0068/25/05/577-584
分类号: