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首页> 外文期刊>Journal of chemical crystallography >X-Ray Structures of Three Polymeric and Two Mononuclear Metal Complexes on the Base of p-Aminobenzoic Acid
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X-Ray Structures of Three Polymeric and Two Mononuclear Metal Complexes on the Base of p-Aminobenzoic Acid

机译:基于对氨基苯甲酸的三种聚合物和两种单核金属配合物的X射线结构

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摘要

Crystals of five coordination compounds have been grown from solutions containing p-aminobenzoic acid (PABA), diethanolamine (DEA) and salt of the definite metal. The X-ray crystallography attests that complexes [Co(PABA)(2)(H2O)(2)](n)center dot H2O (1), [Ni(PABA)(2)(H2O)(2)](n)center dot H2O (1') and [Zn(PABA)(2)(H2O)](n)center dot H2O (2) are polymeric, while Mn(DEA)(2)center dot 2(PABA)center dot 2(H2O) (3) and Cr(DEA)(2)center dot 2(PABA) (4) are mononuclear coordination compounds. In the isomorphic polymers 1 and 1' metal ions are bridged to infinite columns by coordination bonds of the two antiparallel PABA molecules (bimolecular association). The complex 2 is 2-D polymer repeating units of which are hexagons generated by combination of mono- and bimolecular associations. All six coordination sites of Mn2+- and Cr2+-ions in 3 and 4 are occupied by two DEA molecules retaining PABA anions in outer sphere. The CSD analysis shows that there are five types of coordination polymers bridged by O and N atoms of the PABA-molecules. As a result of this research two new type motif polymers have been added to the existing list.
机译:从包含对氨基苯甲酸(PABA),二乙醇胺(DEA)和定金属盐的溶液中生长了五种配位化合物的晶体。 X射线晶体学证明形成了[Co(PABA)(2)(H2O)(2)] [n)中心点H2O(1),[Ni(PABA)(2)(H2O)(2)](n )中心点H2O(1')和[Zn(PABA)(2)(H2O)](n)中心点H2O(2)是聚合的,而Mn(DEA)(2)中心点2(PABA)中心点2 (H2O)(3)和Cr(DEA)(2)中心点2(PABA)(4)是单核配位化合物。在同构聚合物1和1'中,金属离子通过两个反平行的PABA分子(双分子缔合)的配位键桥接至无限列。配合物2是2-D聚合物重复单元,其重复单元是通过单分子和双分子缔合的组合产生的六边形。 3和4中Mn2 +和Cr2 +离子的所有六个配位点都被两个DEA分子占据,这些DEA分子在外球中保留了PABA阴离子。 CSD分析表明,有五种类型的配位聚合物由PABA分子的O和N原子桥接。这项研究的结果是,将两种新型基序聚合物添加到现有列表中。

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