Lu Ying, Xu Yan, Li Yangguang, Wang Enbo, Xu Xinxin, Ma Ying
Institute of Polyoxometalate Chemistry, Department of Chemistry, Northeast Normal University, Changchun 130024, PR China.
Inorg Chem. 2006 Mar 6;45(5):2055-60. doi: 10.1021/ic0515857.
Five new polyoxometalate compounds built on lacunary Wells-Dawson anions and trivalent lanthanide cations, KNa3[Nd2(H2O)10(alpha2-P2W17O61)].11H2O (1), (H3O)[Nd3(H2O)17(alpha2-P2W17O61)].6.75H2O (2), (H2bpy)2[Nd2(H2O)9 (alpha2-P2W17O61)].4.5H2O (3), (H2bpy)2[La2(H2O)9(alpha2-P2W17O61)].4.5H2O (4), and (H2bpy)2[Eu2(H2O)9(alpha2-P2W17O61)].5H2O (5), have been synthesized and characterized by elemental analysis, IR, TG, and single-crystal X-ray diffraction. Compound 1 shows a bisupporting polyoxometalate cluster structure where two {Nd(H2O)7}3+ fragments are supported on the polyoxometalate dimer [{Nd(H2O)3(alpha2-P2W17O61)}2]14-; this represents the first bisupporting polyoxometalate compound based on a polyoxometalate dimer. Compound 2 displays a 1D chain structure built up of bisupporting polyoxoanions [{Nd(H2O)7}2{Nd(H2O)3(alpha2-P2W17O61)}2]8- and Nd3+ ions. Compounds 3-5 are isostructural and show a 2D structure constructed of 1D polyoxometalate chains of [Ln(H2O)2(alpha2-P2W17O61)]n(7n-) linked by Ln3+ ions. Compounds 2-5 represent the first extended structures formed by lacunary Wells-Dawson anions and trivalent lanthanide ions. The influence of the Ln3+/[alpha2-P2W17O61]10- ratio on the syntheses of these five compounds has been studied. Furthermore, the fluorescent activity of compound 5 is reported.
合成了五种基于缺位Wells-Dawson阴离子和三价镧系阳离子的新型多金属氧酸盐化合物，KNa3[Nd2(H2O)10(α2-P2W17O61)].11H2O (1)、(H3O)[Nd3(H2O)17(α2-P2W17O61)].6.75H2O (2)、(H2bpy)2[Nd2(H2O)9 (α2-P2W17O61)].4.5H2O (3)、(H2bpy)2[La2(H2O)9(α2-P2W17O61)].4.5H2O (4) 和 (H2bpy)2[Eu2(H2O)9(α2-P2W17O61)].5H2O (5)，并通过元素分析、红外光谱、热重分析和单晶X射线衍射对其进行了表征。化合物1呈现双支撑多金属氧酸盐簇结构，其中两个{Nd(H2O)7}3+片段支撑在多金属氧酸盐二聚体[{Nd(H2O)3(α2-P2W17O61)}2]14-上；这代表了首个基于多金属氧酸盐二聚体的双支撑多金属氧酸盐化合物。化合物2展示了由双支撑多氧阴离子[{Nd(H2O)7}2{Nd(H2O)3(α2-P2W17O61)}2]8-和Nd3+离子构成的一维链状结构。化合物3 - 5是同构的，呈现出由[Ln(H2O)2(α2-P2W17O61)]n(7n-)的一维多金属氧酸盐链通过Ln3+离子连接而成的二维结构。化合物2 - 5代表了由缺位Wells-Dawson阴离子和三价镧系离子形成的首个扩展结构。研究了Ln3+/[α2-P2W17O61]10-比例对这五种化合物合成的影响。此外，还报道了化合物5的荧光活性。
