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 7nm之间]。
One dimensional(1-D) supramolecular chain-like tetra-Ni sandwiched arsenotungstate [ enH 2 ][ Ni(en) 2 ] 4 [ Ni 4(H 2 O) 2(α-AsW 9 O 34) 2 ].10H 2 O(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 [ Ni 4(H 2 O) 2(α-AsW 9 O 34) 2 ]} 6,two discrete [ Ni(en) 2 ] 2+ cations,one free diprotonated [ enH 2 ] 2+ cation and ten lattice water molecules.Interestingly,adjacent tetra-Ni sandwiched polyoxoanions {[ Ni(en) 2 ] 2 [ Ni 4(H 2 O) 2(α-AsW 9 O 34) 2 ]} 6are connected with each other viathe Ni … O weak interactions [ Ni … O distances : 0.253 2-0.283 7nm ],giving rise to 1-D supramolecular chain-like architecture.
出处
《化学研究》
CAS
2012年第2期8-12,16,共6页
Chemical Research
基金
Supported by the Natural Science Foundation of China(21101055)
China Postdoctoral Science Foundation(20100470996)
Natural Science Foundation of Henan Province(092300410119,102300410093)
Foundation of Education Department of Henan Province(2009A150003,2010B150006)
关键词
多金属氧酸盐
夹心结构
超分子链
砷钨酸盐
polyoxometalate
sandwich structure
supramolecular chain
arsenotungstate