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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 MgCl2 ethanol solution was studied by infrared spectroscopy. The band changes of ethanol molecules show that Mg2 + strongly interacts with C-O in ethanol molecules. At the same time, with the addition of MgCl2, the original hydrogen bond structure is destroyed and a new structure is formed. The solvation number is 3.87 ~ 1.83. Based on the quantitative analysis of the change of the hydrogen bond peak area of each polymer in the solution, the linear relationship between the dimer content and the MgCl2 concentration in the concentration range of 0.3406 ~ 1.6083mol / kg was determined. The linear equation was ΔA = 0.24202 + 16.65859Ci , The correlation coefficient R = 0.9922. The dimer and multimer showed a reversible equilibrium relationship, which further revealed the microscopic process of solution solvation.