五羰基溴化铼中羰基的超快振动光谱

发布时间：2018-06-29 21:42

  本文选题：羰基配合物 + 催化　； 参考：《光谱学与光谱分析》2016年S1期

【摘要】：研究了五羰基溴化铼[Re(CO)5Br]的超快振动动力学。由于分子对称性,一维红外光谱中只表现出两个羰基吸收峰,分别位于1 984.7cm-1(A1)和2 037.6cm-1(E)。由泵浦探测光谱获得了各模式的0→1(基态漂白)和1→2(激发态吸收)的跃迁信号,从而得到了振动态寿命。在时间分辨的二维红外光谱中,每一对角峰取向随等待时间发生了变化,表明都发生了光谱扩散,从中可提取各个振动模式的频率-时间相关函数。此外,我们发现二维红外光谱的非对角峰随时间发生强度变化,表明两个模式间有振动传能。
[Abstract]:The ultrafast vibration kinetics of rhenium pentacarbonyl bromide [re (CO) 5Br] has been studied. Due to molecular symmetry, there are only two carbonyl absorption peaks in one-dimensional infrared spectroscopy, which are located at 1 984.7cm-1 (A1) and 2 037.6cm-1 (E), respectively. The transition signals of 0 ~ 1 (ground state bleaching) and 1 ~ (2) (excited state absorption) of different modes are obtained from the pump detection spectra, thus the vibrational dynamic lifetime is obtained. In the time-resolved two-dimensional infrared spectroscopy, the orientation of each pair of angular peaks varies with the waiting time, indicating that spectral diffusion occurs, from which the frequency-time correlation functions of each vibration mode can be extracted. In addition, we find that the intensity of the non-diagonal peaks of the two-dimensional infrared spectra varies with time, indicating that there is vibration energy transfer between the two modes.
【作者单位】： 北京分子科学国家实验室;中国科学院化学研究所分子反应动力学实验室;中国科学院大学;
【基金】：国家自然科学基金项目(21473212,21327602,21573243)资助
【分类号】：O641.4;O657.33
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