Ultrafast vibrational dynamics and solvation complexes of methyl acetate in methanol studied by sub-picosecond infrared spectroscopy
Ultrafast vibrational dynamics and solvation complexes of methyl acetate in methanol studied by sub-picosecond infrared spectroscopy
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DOI：
10.1002/jrs.2065
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发表时间：
2008-11-01
影响因子：
2.5
通讯作者：
Tominaga, Keisuke
中科院分区：
文献类型：
--
作者：
Banno, Motohiro;Ohta, Kaoru;Tominaga, Keisuke
利用时间分辨红外泵浦-探测光谱研究了乙酸甲酯（MA）在甲醇中CO伸缩振动的动力学。振动能量弛豫（VER）过程包括时间常数为1.3 +/- 0.1和4.0 +/- 0.2 ps的两个分量。这些组分分别来自MA与一个甲醇和MA单体的氢键复合物的振动激发。VER时间的差异被解释为通过分子间氢键的振动态密度（VDOS）的增加。CH_3OH和CH_3OD溶液的时间常数和衰变相关光谱几乎相同。溶剂甲醇分子内OH/OD键的振动模式对MA的振动动力学影响不大。版权所有（C）2008约翰威利父子有限公司
The vibrational dynamics of the CO stretching mode of methyl acetate (MA) in methanol was studied by time-resolved infrared (IR) pump-probe spectroscopy. The vibrational energy relaxation (VER) process includes two components with time constants of 1.3 +/- 0.1 and 4.0 +/- 0.2 ps. These components result from the vibrational excitations of the hydrogen-bonding complex of MA with one methanol and the MA monomer, respectively. The difference in the VER time is explained by the increase of the vibrational density of states (VDOS) by the intermolecular hydrogen bond. The time constants and the decay-associated spectra are almost identical between the CH3OH and the CH3OD solutions. The vibrational modes localized in the intramolecular OH/OD bond of the solvent methanol have little effect on the vibrational dynamics of MA. Copyright (C) 2008 John Wiley & Sons, Ltd.