| 35Cl NMR研究溶液中离子对和离子缔合 |
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| 引用本文： | 李芝芬,荆军平,孙赋,刘瑞麟.35Cl NMR研究溶液中离子对和离子缔合[J].物理化学学报,1992,8(6):772-777. |
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| 作者姓名： | 李芝芬 荆军平 孙赋 刘瑞麟 |
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| 作者单位： | Institute of Physical Chemistry, Peking University, Beijing 100871 |
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| 基金项目： | Project Supported by National Nature Science Fundation of China and Lab. of Magnetic Resonance and Atomic and Molecular Physics |
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| 摘 要： | 测量了Sr和Ba高氯酸盐在乙腈和乙醇中0.5 mol·L~(-1)溶液的~(35)Cl NMR峰宽Δv和粘度η。按核四极矩弛豫机理, 结合文献中Mg~1]和Ca~2]盐的数据, 一种溶剂中各盐的Δv/η之比当反映~(35)Cl核处的电场梯度平方之比。按接触型离子对假设, ~(35)Cl处电场梯度平方之比应等于(r_++r_-)~(-6)。测得各盐的Δv/η之比与计算的(r_++r_-)~(-6)吻合, 论证了在乙腈与乙醇中为接触型离子对。同时文中报告了Δv/η和盐的摩尔电导随水或DMF加入的变化。
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| 关 键 词： | 弛豫速率 电场梯度 离子对 离子溶剂化 高氯酸盐 |
| 收稿时间： | 1991-07-13 |
| 修稿时间： | 1992-01-15 |
~(35)Cl NMR STUDY ON ION PAIR AND IONIC SOLVATION IN SOLUTION |
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| Li Zhifen,Jing Junping,Sun Bin,Liu Ruilin Institute of Physical Chemistry,Peking University,Beijing ,China.~(35)Cl NMR STUDY ON ION PAIR AND IONIC SOLVATION IN SOLUTION[J].Acta Physico-Chimica Sinica,1992,8(6):772-777. |
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| Authors: | Li Zhifen Jing Junping Sun Bin Liu Ruilin Institute of Physical Chemistry Peking University Beijing China |
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| Institution: | Institute of Physical Chemistry, Peking University, Beijing 100871 |
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| Abstract: | This research has recorded the linewidth of ~(35)Cl of Sr(ClO_4)_2 and Ba(ClO_4)_2 at 0.5 mol·L~(-1) in acetonitrile and ethanol. In terms of nuclear quadrupole moment relaxation mechanism and together with the results for Mg(ClO_4)_2 and Ca(ClO_4)_2 in literature contact type of ion pair for perchlorate salts of alkali earth metals was argued. The linewidth of ~(35)Cl at fixed concentration of Sr (ClO_4)_2 and Ba(ClO_4)_2 in acetonitrile or ethanol as bulk solvent was measured as a function of B]/M~(2+)]. where B represents H_2O or DMF. The trend of the plot and the reason for that were explained and the solvation number for Sr~(2+) were estimated. Mole conductivities of salts were also measured and explained for supporting of contact ion pair. |
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| Keywords: | Relaxation rate Electric field gradient Ion pair Ionic solvation Perchlorate salts |
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