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Raman光谱方法研究三氯甲烷与苯分子问的C／H…π相互作用米
Raman spectroscopy study on the C/H…π interaction between benzene and chloroform＊
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摘要: 测量了不同浓度三氯甲烷（CHCl3）与苯（C6H6）二元溶液的Raman光谱，随C6H6浓度的增加，受分子问C／H…兀相互作用的影响，CHCl3中c—H键伸缩振动频率向低波数移动；当CHCl3体积分数小于40％，C—_H键伸缩振动频率不变，分子间C／H…π相互作用达到饱和．分别以CHCl3和C6H6体积分数为70％的CHCl3．C6H6混合溶液为研究对象，测量了它们的高压和低温Raman光谱．根据CHCl3中C—H键伸缩振动频率随压强和温度的变化关系，得出了分子间C／H…π相互作用对压强和温度的扰动表现出不稳定性．Abstract: Raman spectra of benzene and chloroform with different relative concentrations are measured. The frequencies of C--H stretching vibration in chloroform shift to lower wave number with the increase of benzene concentration, which can be explained by C/H…π interaction. This interaction is saturated when the chloroform volume fraction is less than 40%： the frequencies of C--H stretching vibration remain the same. Taking the chloroform volume fraction of 70% chloroform and benzene mixed solution as the research object, the Raman spectra of binary solution and pure liquid are measured at different pressures and temperatures. According to the relationship between pressure and temperature of the frequencies of C--H stretching vibration in chloroform, the regular pattern of C/H…π interaction is obtained.
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