一种一维超分子链状四核镍夹心砷钨酸盐的合成和表征

摘要

利用水热方法合成了一种一维超分子链状四核镍夹心的砷钨酸盐[enH2][Ni(en)2]4[Ni4 (H2O)2(α-AsW9O34)2]·10H2O (1) (en=ethylene diamine)；借助元素分析、红外光谱和单晶X射线衍射对其进行了表征.结果表明,化合物1的分子结构单元由1个二支撑的四核镍夹心砷钨酸盐多阴离子{[Ni(en)2]2 [Ni4 (H2O)2(α-AsW9O34)2]}6-,2个游离的[Ni(en)2]2+配离子,1个游离的双质子化[enH2]2+阳离子和10个结晶水分子组成.有趣的是,相邻的四核镍夹心砷钨酸盐多阴离子{[Ni(en)2]2[Ni4(H2O)2 (α-AsW9O34)2])6-借助Ni…O弱相互作用构筑一维超分子链状结构[Ni…O距离分布在0.253 2～0.283 7 nm之间].%One dimensional (1-D) supramolecular chain-like tetra-Ni sandwiched arsenotungstate [enH2][Ni(en)2]4[Ni4(H2O)2(a-AsW9O34)2]·10H2O (1) (en =ethylene diamine) was synthesized using a hydrothermal route.As-synthesized product was characterized by means of elemental analysis,infrared spectrometry and single-crystal X-ray diffraction. It has been found that the molecular structural unit of 1 consists of a two-supporting tetra-Ni sandwiched polyoxoanion { [Ni(en)2 ]2 [Ni4 (H2O)2 (a-AsW9O34 )2 ] } 6-,two discrete [Ni (en)2 ]2+ cations,one free diprotonated [enH2]2+ cation and ten lattice water molecules.Interestingly,adjacent tetra-Ni sandwiched polyoxoanions { [Ni(en)2 ]2 [Ni4(H2O)2 (α-AsW9O34)2 ] }6- are connected with each other via the Ni…O weak interactions [Ni…O distances:0.253 2-0.283 7 nm],giving rise to 1-D supramolecular chain-like architecture.