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无机离子的核磁共振是研究溶液中分子结构与动力学现象的一种有力工具。~7Li、~(23)Na、~(39)K、~(25)Mg、~(205)Tl NMR等研究所获取的信息,能有助于阐明有关金属离子与小分子、分子膜、蛋白质等之间的相互作用。~(113)Cd核对溶液中的瞬时环境很敏感,但以~(113)Cd NMR研究溶液中Cd~(2+)与配体的配合研究却不多。本文以~(113)Cd NMR研究了在H_2O中Cd~(2+)与18-冠-6(18C6)、12-冠-4(12C)的配合作用;以非线性最小二乘法程序拟合计算出在H_2O中CdSO_4离子对的形成常数;同时,用~(113)Cd NMR测量了两种配体与Cd~(2+)竞争配合物形成常数,这些研究尚未见文献报道。
Nuclear magnetic resonance of inorganic ions is a powerful tool for studying the molecular structure and kinetics of solutions. The information obtained from ~ 7Li, ~ (23) Na, ~ (39) K, ~ (25) Mg, ~ (205) Tl NMR can help clarify the correlation between metal ions and small molecules, molecular films, And so on the interaction between. However, there is not much research on the coordination between Cd2 + and Cd2 + in solution by ~ (113) Cd NMR. In this paper, the interaction between Cd 2+ and 18-crown-6 (18C6) and 12-crown-4 (12C) in H_2O was studied by ~ (113) Cd NMR and fitted by nonlinear least square method The formation constants of CdSO_4 ion pair in H_2O were calculated. At the same time, the formation constants of the two ligands and the Cd_ (2+) complex were measured by ~ (113) Cd NMR. These studies have not been reported in the literature.