乙腈体积分数对水的氢键网络结构的影响  

Effect of acetonitrile concentration fraction on hydrogen-bonding network of water

作　　者：龚楠 孙成林[1] 曹献文 里佐威[1] 房文汇[2] 门志伟[1] GONG Nan;SUN Cheng-lin;CAO Xian-wen;LI Zuo-wei;FANG Wen-hui;MEN Zhi-wei(College of Physics,Jilin University,Changchun 130012,China;College of Physics,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]吉林大学物理学院,吉林长春130012 [2]长春理工大学理学院,吉林长春130022

出　　处：《吉林师范大学学报（自然科学版）》2018年第2期36-39,共4页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(11574113;11604024)

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.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 micro-confocal Raman spectroscopy.By changing the concentration fraction of acetonitrile in water,the hydrogen-bonding 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 Xcn<0.3.As the concentration fraction is in the range 0.3<Xcn<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.

关 键 词：拉曼光谱 氢键 乙腈.水混合物 

分 类 号：O641.3[理学—物理化学] O657.37[理学—化学]