Cubic Metal−Organic Polyhedrons of Nickel(II) Imidazoledicarboxylate Depositing Protons or Alkali Metal Ions
Cubic Metal−Organic Polyhedrons of Nickel(II) Imidazoledicarboxylate Depositing Protons or Alkali Metal Ions
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DOI：
10.1021/cg8000762
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发表时间：
2008-05
影响因子：
3.8
通讯作者：
Qiang Xu;R. Zou;Ruiqin Zhong;C. Kachi‐Terajima;S. Takamizawa
中科院分区：
文献类型：
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作者：
Qiang Xu;R. Zou;Ruiqin Zhong;C. Kachi‐Terajima;S. Takamizawa
硝酸镍（II）与4，5-咪唑二甲酸（H3 L）在中性或碱性条件下反应，合成了一系列具有均一Ni 8立方结构单元的镍配位聚合物[（Ni 8（H2 L）8（HL）4）]·8（C2 H5 OH）·18（H2O）1，K20[Ni 8L 12]·74（H2O）2a，K20 [Ni 8L 12]·50（H2O）2b，和K20[Ni 8L 12]·29（H2O）2c。结果表明，配合物1是一个中性的金属-有机多面体，羧基氧原子上有20个质子，羧基氧原子与客体乙醇通过分子间氢键形成三维超分子结构.配合物2a呈现出一个水海洋，其中每个Ni 8立方结构单元周围有20个钾离子和74个水分子。在客体水分子逐渐损失的过程中，2a中相邻的立方体结构单元重新排列形成其脱水产物2b和2c，结晶度保持不变。研究了其磁性能。
Reactions of nickel(II) nitrate with 4,5-imidazoledicarboxylic acid (H3L) in neutral or basic environment result in a series of novel nickel coordination polymers with a uniform Ni8 cubic building block, [(Ni8(H2L)8(HL)4)]·8(C2H5OH)·18(H2O) 1, K20[Ni8L12]·74(H2O) 2a, K20[Ni8L12]·50(H2O) 2b, and K20[Ni8L12]·29(H2O) 2c. The result shows that complex 1 assembles into a discrete neutral metal−organic polyhedron with 20 protons located in the carboxyl oxygen atoms, which are linked into a three-dimensional supramolecular architecture by intermolecular hydrogen bonds between guest ethanol and host carboxyl oxygen atoms. Complex 2a exhibits a water ocean, in which there are 20 potassium ions and 74 water molecules around each Ni8 cubic building block. During the course of gradual loss of the guest water molecules, the adjacent cubic building blocks in 2a rearrange to form its dehydrated products 2b and 2c, the crystallinity remaining. The magnetic properties have been investigated.