【摘要】 利用17O-NMR化学位移、半峰宽和核磁共振系数(B’)与水团簇结构和水分子缔合的关系,分析了CuCl2和CuSO4对水结构的影响.同时比较了纯水和不同浓度CuCl2和CuSO4溶液的羟基伸缩振动拉曼光谱.研究表明,CuCl2和CuSO4均具有促进水分子缔合,使水团簇加大的作用,且CuSO4对水的缔合作用大于CuCl2,Cl-对水缔合的破坏作用大于SO42-·Cu2+作为顺磁离子,在核磁共振弛豫过程中,对缩短水中质子的自旋-晶格弛豫时间,使谱线变宽作用明显.拉曼光谱主要反映阴离子对水结构的影响,而17O-NMR方法能够全面反映阴、阳离子和化合物对水缔合程度的影响.更多还原

【Abstract】 The influences of CuCl2 and CuSO4 upon the water structure were studied with 17O-NMR and Raman spectra. The effects of CuCl2 and CuSO4 on 17O-NMR chemical shift,half-height widths of peaks and spin-lattice relaxation times(T1) of water were tested at low concentrations. With the relationship between 17O-NMR chemical shift, half-height widths of peaks, NMR B’-coefficients and water cluster structure, water association, the effect of CuCl2 and CuSO4 on water structure were analyzed. Raman spectra in the OH stretch region of water and various concentrations of CuCl2 and CuSO4 were compared. It was proved that they all increased water association and the size of water clusters, the effect of CuSO4 on promotion water association was stronger than that of CuCl2, at the same time, the effect of Cl- on break water association was stronger than that of SO2-4. As paramagnetic ion, Cu2+ had obvious effect on shorten protons spin-lattice relaxation times in water and broaden the line width of NMR spectroscope during NMR relaxation process. 17O-NMR could bring more information on the influences of cations, anions, and compounds on water structure than Raman spectra, which only indicated the influence of anions.更多还原