摘要
合成了一种新颖的修饰型的Keggin结构多金属氧酸盐超分子化合物,并用单晶衍射仪测定了其晶体结构,元素分析及红外光谱等进一步佐证了化合物的结构.配合物为三斜晶系,P-1空间群,晶胞参数为a=12.969 4(11),b=14.025 0(11),c=24.518 0(19),α=86.511 0(10)°,β=83.033 0(10)°,γ=62.777 0(10)°,V=3 936.4(5)3,Z=1.配合物是一种特殊的双帽双支撑型的多金属氧酸盐,它是由双帽假Keggin[PMo7ⅥMo5ⅤO40(VⅣO)2]^4-单元,{Co(2,2′-bipy)2(H2O)}和[Co(bipy)3]^2+部分组成.其中,两个金属有机阳离子{Co(2,2′-bipy)2(H2O)}和两个盖帽的钒原子上的末端氧原子通过共价连接在[PMo7^ⅥMo4^ⅤV^ⅤO40(V^ⅣO)2]上,并通过氢键作用形成三维层状结构.
A new Keggin-polyoxometalate complex,{PMo7^ⅥMo4^ⅤV^ⅤO40(V^ⅣO)2[Co(bipy)2(H2O)]2}[Co(bipy)3]2{PMo7^ⅥMo4^ⅤV^ⅤO40(V^ⅣO)2}·6H2O has been synthesized in aqueous.The structure was determined by single crystal X-ray diffraction and characterized by elemental analysis,IR spectroscopy and thermogravimetric analysis.Crystal data for it:Triclinic,space group P-1,a=12.9694(11),b=14.0250(11),c=24.5180(19),α=86.5110(10)°,β=83.0330(10)°,γ=62.7770(10)°,V=3936.4(5)3,Z=1.Complex is an unusual bicapped bisupporting POM.It is composed of bicapped pseudo-keggin [PMoⅥ7MoⅤ5O40(VⅣO)2]4-,[Co(bipy)3] and {Co(2,2′-bipy)2(H2O)} fragments.One [PMoⅥ7MoⅤ5O40(VⅣO)2] unit acts as a ligand covalently bonded to two {Co(2,2′-bipy)2(H2O)} subunits through the terminal oxygen atoms of the two capping V atoms.The 3-D structure constructed by weak hydrogen-bonded and electrostatic interaction.
出处
《北华大学学报(自然科学版)》
CAS
2010年第3期213-217,共5页
Journal of Beihua University(Natural Science)
基金
国家自然科学基金资助项目(20773057)
关键词
多金属氧酸盐
水热合成
晶体结构
polyoxometalate
hydrothermal synthesis
crystal structure