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Rotational reorientation dynamics of oxazine 750 in polar solvents
Zhou, Panwang1,2; Song, Peng1,2; Liu, Jianyong1; Shi, Ying1; Han, Keli1; Het, Guozhong1; Han KL(韩克利)
刊名JOURNAL OF PHYSICAL CHEMISTRY A
2008-04-24
DOI10.1021/jp7120998
112期:16页:3646-3655
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]Chemistry, Physical ; Physics, Atomic, Molecular & Chemical
研究领域[WOS]Chemistry ; Physics
关键词[WOS]DIELECTRIC FRICTION MODELS ; ELECTROLYTE-SOLUTIONS ; MOLECULAR-DYNAMICS ; DYE MOLECULES ; FLUORESCENCE DEPOLARIZATION ; CHARGE-DISTRIBUTION ; PYRROLOPYRROLE DERIVATIVES ; VIBRATIONAL-RELAXATION ; ORIENTATIONAL MOTION ; ULTRAFAST DYNAMICS
英文摘要The rotational reorientation dynamics of oxazine 750 (OX750) in the first (with pump pulse at 660 nm) and a higher excited state (with pump pulse at 400 nm) in different polar solvents have been investigated using femtosecond time-resolved stimulated emission pumping fluorescence depletion (FS TR SEP FD) spectroscopy. In both excited states, three different anisotropy decay laws have been observed for OX750 in different solvents. Only in acetone and formamide could the anisotropy decays of OX750 be described by single-exponential functions, whereas the anisotropy decays have been found to exhibit biexponential behavior in other solvents. The slower anisotropy decay observed in all of the solvents has been assigned to the overall rotational relaxation of OX750 molecules, and a quantitative analysis of this time constant has been performed using the Stokes-Einstein-Debye hydrodynamic theory and the extended charge distribution model developed by Alavi and Waldeck. In both methanol and ethanol, a faster anisotropy decay on the order of picoseconds and a slower anisotropy decay on the hundreds of picoseconds time scale are observed. The most likely explanation for the faster anisotropy involves the rotation of the transition dipole moment in the excited state of OX750 resulting from the electron transfer (ET) reaction taking place from the alcoholic solvents to the OX750 chromophore. As a possible explanation, the wobbling-in-the-cone model has been used to analyze the biexponential anisotropy decays of OX750 in dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). The observed faster anisotropy decays on the hundreds of fermoseconds time scale in DMF and DMSO are ascribed to the wobbling-in-the-cone motion of the ethyl group of OX750, which is sensitive to the strength of the hydrogen bond formed between the solvent and the protonation site of OX750.
语种英语
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WOS记录号WOS:000255104800018
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/101181
专题中国科学院大连化学物理研究所
通讯作者Han KL(韩克利)
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 100049, Peoples R China
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Zhou, Panwang,Song, Peng,Liu, Jianyong,et al. Rotational reorientation dynamics of oxazine 750 in polar solvents[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2008,112(16):3646-3655.
APA Zhou, Panwang.,Song, Peng.,Liu, Jianyong.,Shi, Ying.,Han, Keli.,...&韩克利.(2008).Rotational reorientation dynamics of oxazine 750 in polar solvents.JOURNAL OF PHYSICAL CHEMISTRY A,112(16),3646-3655.
MLA Zhou, Panwang,et al."Rotational reorientation dynamics of oxazine 750 in polar solvents".JOURNAL OF PHYSICAL CHEMISTRY A 112.16(2008):3646-3655.
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