镁离子作用下乙醇溶液的红外光谱研究

Study on the Infrared Spectra of Ethanol under Action of Mg^(2+)

采用红外光谱法对MgCl2乙醇溶液进行了研究。乙醇分子的谱带变化表明,Mg2+与乙醇分子中C—O发生强烈作用,同时,随着MgCl2的加入,原有氢键结构遭到破坏,形成新的结构,计算得到其溶剂化数为3.87～1.83。针对溶液中各聚体氢键峰面积的变化进行了定量分析,确定了在0.3406～1.6083mol/kg浓度范围内二聚体含量与MgCl2浓度呈线性关系,其线性方程为ΔA=0.24202+16.65859Ci,相关系数R=0.9922,二聚体和多聚体呈可逆平衡关系,进一步揭示了溶液溶剂化的微观过程。

The infrared spectra of ethanol solutions have been investigated by using infrared spectroscopy under the MgCl2 solvation. The changes of infrared spectra of the solution showed that Mg^2＋ interact with ethanol, which reflects in the shifts of the ethanol C-O stretch. New hydrogen bond structures have formed due to the addition of MgCl2. Through the linear regression and qualitatively calculation on obtained spectra, the solvent numbers of Mg^2＋ at different molar concentrations are between 3.87 and 1.83. Moreover the linear regression equation and correlation coefficient of dimer are △A = 0.24202 ＋ 16.65859Ci and 0.9922, respectively. These further explain the microscopic characterization of the solution process.