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Self-assembly of an Unprecedented Cynao-bridged One-dimensional 4f-3d Complex[Nd(DMF)4(H2O)2Cr(CN)6nH2O}

KOU Huizhong,GAO Song,SUN Baiwang,MA Baoqing   

  1. State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing, 100871
  • Received:2000-06-17 Online:2001-03-20 Published:2001-03-20



  1. 北京大学,稀土材料化学和应用国家重点实验室,北京,100871

Abstract: A bimetallic complex {[Nd(DMF)4(H2O)2Cr(CN)6]·H2O}n is reported. It was synthesized as yellow crystals by self-assembly of NdBr3·6H2O,H2 salen and (Bu4N)3[Cr(CN)6](molar ratio of 1∶1∶1) in methanol-DMF mixed solution.Single-crystal X-ray diffraction analysis shows that it consists of a cyano-bridged chain structure. The Nd atom is eight-coordinate with a distorted square antiprism geometry. Each Cr(CN)6 coordinates to two Nd(Ⅲ) ions using two cis cyanide ligands, while each Nd(DMF)4(H2O)2 group connects two Cr(CN)6 moieties in a cis fashion, giving rise to an unprecedented chain structure. Crystal data:monoclinic, space group P21/c, a=13.200(3), b=12.996(3), c=19.211(4)A°, β=109.93(3)°, V=3098.4(11)A°3, Z=4, S=1.012, R1=0.0386, wR=0.0751.

Key words: crystal structure, neodymium(Ⅲ) complex, hexacyanochromate(Ⅲ) complex, cyano-bridge, one-dimension complex

摘要: 报道了一个氰根桥连的4f-3d一维链状配合物[Nd(DMF)4(H2O)2Cr(CN)6]·H2O。它是由NdBr3·6H2O,H2salen和(Bu4N)3[Cr(CN)6](摩尔比为1∶1∶1)在甲醇-DMF混合溶剂中自组装得到。由X-射线单晶衍射结构分析得知其属于单斜晶系,空间群为P21/c,晶体数据a=13.200(3), b=12.996(3),c=19.211(4)A°, β=109.93(3)°, V=3098.4(11)A°3, Z=4, S=1.012, R1=0.0386, wR=0.0751。在配合物中,每个Nd离子以顺式方式连接2个Cr离子,而每个Cr离子同样以顺式方式连接2个Nd离子,得到一个新颖的类长城链状结构。配位和晶格水分子通过氢键将相邻的NdCr一维链连成三维网状结构。

关键词: 晶体结构, 钕(Ⅲ)配合物, 六氰合铬(Ⅲ)配合物, 氰桥, 链状配合物

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