乙二胺三乙酸与锌(Ⅱ)、钴(Ⅱ)相互作用的固体和溶液化学特性

doi:10.11944/j.issn.1000-0518.2016.01.150208

摘要/Abstract

摘要：

在水热和弱酸性反应条件下,螯合型表面活性剂前驱体乙二胺三乙酸分别与氯化锌、氯化钴反应,形成水合乙二胺三乙酸金属配合物[M(H₂O)₆][M(ED3A)(H₂O)]₂·2H₂O[M=Zn(1),Co(2);H₃ED3A=乙二胺三乙酸,C₈H₁₄N₂O₆]。产物经元素分析、红外、热重、液体核磁共振和X射线单晶衍射结构表征。乙二胺三乙酸和锌(Ⅱ)、钴(Ⅱ)五配位,并与水一起形成典型的[MN₂O₄]或[MO₆]八面体结构。 ¹³C核磁共振实验结果表明,溶液中乙二胺三乙酸与锌形成配合物在弱酸性条件下(pH值3~7)稳定存在,在酸性溶液中完全解离,乙二胺三乙酸进一步经分子内成环反应生成3-酮哌嗪二乙酸(H₂kpda=C₈H₁₂N₂O₅)。

关键词: 乙二胺三乙酸, 酮哌嗪二乙酸, 化学平衡, 锌, 钴, 13C核磁共振

Abstract:

Zinc and cobolt ethylenediaminetriacetates [M(H₂O)₆][M(ED3A)(H₂O)]₂·2H₂O[M=Zn(1), Co(2); H₃ED3A=ethylenediaminetriacetic acid, C₈H₁₄N₂O₆] were obtained on the hydrothermal conditions at 140 ℃ in a weak acidic solution. Complexes 1 and 2 were characterized by elemental analysis, IR, TG-DTG, solution ¹³C NMR spectroscopy, and X-ray analysis. ED3A coordinates with zinc or cobalt ions as a pentadentate ligand. The metal ions are arranged in octahedral coordination geometries [MN₂O₄] or [MO₆]. Comparisons of ¹³C NMR spectra demonstrate that the coordination of ED3A zinc complex is stable in weak acidic solution(pH 3~7), while ED3A cyclizes to form ketopiperazinediacetic acid(H₂kpda, C₈H₁₂N₂O₅) under acidic condition.

Key words: ethylenediaminetriacetic acid, ketopiperazinediacetic acid, equilibrium, zinc, cobalt, 13C NMR spectra

吴睿, 杨玉琛, 董鑫, 周朝晖. 乙二胺三乙酸与锌(Ⅱ)、钴(Ⅱ)相互作用的固体和溶液化学特性[J]. 应用化学, 2016, 33(1): 70-75.

WU Rui, YANG Yuchen, DONG Xin, ZHOU Zhaohui. Solid and Solution Properties of Zinc(Ⅱ) and Cobalt(Ⅱ) with Ethylenediaminetriacetate[J]. Chinese Journal of Applied Chemistry, 2016, 33(1): 70-75.

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