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);H3 ED3A=乙二胺三乙酸,CsH14N2O6].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).
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