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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Multi-dimensional transition-metal coordination polymers with 5-nitro-1,2,3-benzenetricarboxylic acid exhibiting ferro-/antiferromagnetic interactions
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Multi-dimensional transition-metal coordination polymers with 5-nitro-1,2,3-benzenetricarboxylic acid exhibiting ferro-/antiferromagnetic interactions

机译:具有5-硝基-1,2,3-苯三甲酸的多维过渡金属配位聚合物表现出铁/反铁磁相互作用

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Six transition metal coordination polymers, [Cu_3(nbta) _2(bipy)_2(H_2O)_2]·2H _2O (1), [Cu_3(nbta)_2(bpp)_2(H _2O)_2]·2H_2O (2), [Co_3(nbta) _2(bipy)_3(H_2O)_2]·2H _2O (3), [Co_3(nbta)_2(bpp)_2(H _2O)_2] (4), [Ni_2(Hnbta)_2(bipy) _2(H_2O)_2] (5) and [Ni_3(nbta) _2(bpa)_3(H_2O)_2]·2H _2O (6) (H_3nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, bipy = 4,4′-bipyridine, bpa = 1,2-bis(4-pyridyl)ethane, bpp = 1,3-bis(4-pyridyl)propane), have been hydrothermally synthesized by the reactions of Cu~(II), Co~(II) and Ni~(II) salts with H_3nbta in the presence of dipyridyl-type co-ligands, respectively. Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, and TG analyses. Compounds 1-4 and 6 exhibit 3D pillared-layer structures while compound 5 has a 2D layer. The nbta~(3-) ligands in the 2D carboxylate layer motifs of 1-4 and 6 connect transition metal ions in different coordination modes, and the dipyridyl-type co-ligands in compounds 1-4 and 6 serve as the pillar between the 2D layers, creating 3D open frameworks. From a topologic point of view, complex 1, 2 and 4 present 4-connected 3D coordination frameworks with the topologies of (4~2·6~2·8~2) (6 ~2·7~2·8~2) (4~2· 6~2·7·8), (6~4·8~2) (4 ~2·6~4) (4~2·6~4) and (4·6~4·8)(4~4·6~2)(4 ~3·6~3) respectively. Complex 3 shows a (4,5)-connected 3D network with (4~2·6~7·8) (6~4·8~2)(4~2·6~4) topology. Whereas the structure of 5 is a 2D (4,4) net due to the partially deprotonated H_3nbta ligand existed. Complex 6 features a 3D (4,5)-connected framework with (4·6~8·8) (6 ~5·8) (4·6~5) topology, also exhibiting the intriguing helical motif. The variable-temperature magnetic susceptibility studies reveal antiferromagnetic interactions between Cu~(II) or Co ~(II) ions in 1, 2, 3, 4 and ferromagnetic interactions between Ni ~(II) ions for 5 and 6, respectively.
机译:六种过渡金属配位聚合物,[Cu_3(nbta)_2(bipy)_2(H_2O)_2]·2H _2O(1),[Cu_3(nbta)_2(bpp)_2(H _2O)_2]·2H_2O(2), [Co_3(nbta)_2(bipy)_3(H_2O)_2]·2H _2O(3),[Co_3(nbta)_2(bpp)_2(H _2O)_2](4),[Ni_2(Hnbta)_2(bipy) )_2(H_2O)_2](5)和[Ni_3(nbta)_2(bpa)_3(H_2O)_2]·2H _2O(6)(H_3nbta = 5-硝基-1,2,3-苯三甲酸,bipy =通过Cu〜(II)反应水热合成了4,4'-联吡啶,bpa = 1,2-双(4-吡啶基)乙烷,bpp = 1,3-双(4-吡啶基)丙烷,在二吡啶基型共配体存在下,分别与H_3nbta形成Co〜(II)和Ni〜(II)盐。它们的结构通过单晶X射线衍射分析确定,并通过元素分析,IR光谱和TG分析进一步表征。化合物1-4和6具有3D柱状结构,而化合物5具有2D层。 1-4和6的2D羧酸盐层基序中的nbta〜(3-)配体以不同的配位模式连接过渡金属离子,化合物1-4和6中的二吡啶基型共配体充当两者之间的支柱。 2D层,创建3D开放框架。从拓扑的角度来看,复杂的1、2和4提供了4个连接的3D协调框架,其拓扑为(4〜2·6〜2·8〜2)(6〜2·7〜2·8〜2) (4〜2·6〜2·7·8),(6〜4·8〜2)(4〜2·6〜4)(4〜2·6〜4)和(4·6〜4·8 )(4〜4·6〜2)(4〜3·6〜3)。复杂3显示了一个(4,5)连接的3D网络,其中具有(4〜2·6〜7·8)(6〜4·8〜2)(4〜2·6〜4)拓扑。由于存在部分去质子化的H_3nbta配体,因此5的结构是2D(4,4)网。配合物6具有3D(4,5)连接的框架,具有(4·6〜8·8)(6〜5·8)(4·6〜5)拓扑,还显示出有趣的螺旋图案。变温磁化率研究表明,分别存在1、2、3、4中的Cu〜(II)或Co〜(II)离子之间的反铁磁相互作用以及分别存在5和6的Ni〜(II)离子之间的铁磁相互作用。

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