高等学校化学学报

高等学校化学学报 ›› 1983, Vol. 4 ›› Issue (5): 605.

• 论文 • 上一篇    下一篇

离子水化过程的核磁共振研究——二-(2-乙基己基)膦酸-长链醇-煤油-水体系

吴瑾光1, 高宏成1, 陈滇1, 金天柱1, 徐光宪1, 孙贤育2, 张水珍2, 伍华菊2, 王昌瑾2   

  1. 1. 北京大学化学系;

    2. 中国科学院感光化学研究所
  • 收稿日期:1982-03-10 出版日期:1983-10-24 发布日期:1983-10-24

NMR STUDY ON THE HYDRATION OF IONS IN MICROEMULSION——BIS-2-ETHYLHEXYL PHOSPHORIC ACID-ALCOHOL- KEROSINE-WATER MICROEMULSION SYSTEM

Wu Jinguang1, Gao Hongcheng1, Chen Dian1, Jin Tianzhu1, Xu Guangxian1, Sun Xianyu2, Zhang Shuizhen2, Wu Huaju2, Wang Changjin2   

  1. 1. Department of Chemistry, Peking University, Beijing;

    2. Institute of Photographic Chemistry, Academic Sinica, Beijing
  • Received:1982-03-10 Online:1983-10-24 Published:1983-10-24

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摘要： 本文利用无水皂化萃取剂加水生成微乳状液研究离子水化的新方法,研究了酸性膦酸酯D2EHPA(碱金属盐)-ROH-煤油-水体系中,通过对水质子化学位移变化的规律来研究碱金属的水合作用,所得结果与环烷酸体系相似。当[M+]/[H2O]从100/1向1/100变化时,可以看到配位水的化学位移比缔合水(即正常液体水)向低场移动近2ppm,这比通常在浓盐水溶液中观察到的差值提高了一个数量级。当[M+]/[H2O]大于100/1时,配位水的化学位移随阳离子不同而趋于不同的极限值,其顺序为NH4+(6.76)>Li+(6.60)>Na+(5.96)>K+(5.40)。 从不同体系NMR图峰形和半高宽度Δv1/2的变化,可以观察到阴离子的结构和组成对离子的水化作用有较大的影响。有关阴离子水合情况的研究工作正在进行中。

Abstract: In the present investigation we have observed the proton shift of water of hydration of metal ions in a microemulsion formed by adding water gradually from 0.05% to 20.0% to a moisture free bis-2-ethylhexyl phosphoric acid-alcohol-kerosine system saponified by metallic sodium, so that the ratio of concentrations (M+)/(H2O) can be varied from 100:1 to 1:100. Under such conditions we have obtained the limits of H2O (M+) for various cations as follows. 6.76ppm (NH4+), 6.60(Li+), 5.96 (Na+), 5.40(K+), while the proton shift of liquid water is H2O = 4.80 ppm. The half widths of NMR peaks in the organophosphoric acid extractant system are much wider than those of naphthenic acid system reported in ( Ⅰ ). This may be explained that the organophosphoric acid anion is also hydrated in addition to the cation.

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