【摘要】 拉曼光谱是研究液体分子及分子间相互作用的主要振动光谱技术.本文采用显微共聚焦拉曼光谱研究了乙腈-水二元溶液中水的振动特性.通过改变乙腈-水系统的体积分数,水的氢键网络结构将受到影响.测量了乙腈体积分数10%⁹0%的水溶液.结果表明:在低的体积分数下X_cn<0.3时,水分子呈现氢键网络结构;0.3<X_cn<0.5时,水分子呈现氢键网络结构与复合物共存形态.乙腈分子体积分数占优势时,水分子对称伸缩振动发生红移,水分子间及乙腈-水复合物的氢键强度减弱,氢键网络结构将会破坏,拉曼模式的线宽、峰形发生改变.更多还原

【Abstract】 Raman spectroscopy is one of the most important vibrational techniques in probing the intermolecular interactions. In this report,vibrational properties of acetonitrile-water mixtures are investigated by microconfocal Raman spectroscopy. By changing the concentration fraction of acetonitrile in water,the hydrogenbonding network structure of water is strongly disturbed. The concentration fraction of acetonitrile varies from the range from 10% to 90%. The results show that water exhibit hydrogen-bonding network structure in a low concentration of acetonitrile when X_cn< 0. 3. As the concentration fraction is in the range 0. 3 < X_cn< 0. 5,both the hydrogen-bonding network and acetonitrile-water complex will exist in the solution. Continued increasing the concentration leads to the dominance of the acetonitrile and destroy of water hydrogen-bonding which cause the red shift and bandwidth changing of OH stretching in Raman spectrum.更多还原