硫酸盐体系中阳离子对水分子氢键的破坏效应

Destructive Effect of Cation on Hydrogen Bond of Water Molecules in Sulfate System

利用拉曼光谱对室温下Na 2SO 4-H 2O、MgSO 4-H 2O、ZnSO 4-H 2O、Fe 2(SO 4)3-H 2O体系中水分子的O—H伸缩振动情况开展研究。首先,通过对频谱中2800~4000 cm-1区间,特别是3400 cm-1附近主峰拉曼位移的移动幅度和3200 cm-1附近肩峰强弱的考察,研究了拉曼光谱中不同阳离子浓度和类型对水分子中O—H伸缩振动的影响规律。其次,借助高斯拟合分峰的方法考察了各阳离子对水分子不同氢键结构类型的破坏效应。最后,系统分析了配合物的生成和阳离子破坏效应的共同作用。结果表明:不同阳离子的硫酸盐溶液对水分子氢键的破坏能力规律为:Na 2SO 4>Fe 2(SO 4)3>MgSO 4>ZnSO 4。

The O—H stretching vibration of water in Na 2SO 4-H 2O,MgSO 4-H 2O,ZnSO 4-H 2O,Fe 2(SO 4)3-H 2O systems at room temperature was studied by Raman spectroscopy.Firstly,the influence of different cation concentrations and types in Raman spectra on O—H stretching vibration in water molecules was investigated by studying the range of 2800~4000 cm-1,especially the movement of main peak Raman displacement around 3400 cm-1 and the strength of acromion around 3200 cm-1.Secondly,the damage effect of each cation on different hydrogen bond structure types of water molecule was studied by gaussian fitting method.Finally,the combined actions of the formation of coordination compound and the cationic destruction effect were analyzed.Results show that the damage ability of sulfate solution of different cation to hydrogen bond of water molecule can be sorted as follows:Na 2SO 4>Fe 2(SO 4)3>MgSO 4>ZnSO 4.