ic0515857_si_006.cif (41.65 kB)

New Polyoxometalate Compounds Built up of Lacunary Wells−Dawson Anions and Trivalent Lanthanide Cations

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posted on 06.03.2006, 00:00 by Ying Lu, Yan Xu, Yangguang Li, Enbo Wang, Xinxin Xu, Ying Ma
Five new polyoxometalate compounds built on lacunary Wells−Dawson anions and trivalent lanthanide cations, KNa3[Nd2(H2O)102-P2W17O61)]·11H2O (1), (H3O)[Nd3(H2O)172-P2W17O61)]·6.75H2O (2), (H2bpy)2[Nd2(H2O)92-P2W17O61)]·4.5H2O (3), (H2bpy)2[La2(H2O)92-P2W17O61)]·4.5H2O (4), and (H2bpy)2[Eu2(H2O)92-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)32-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)32-P2W17O61)}2]8- and Nd3+ ions. Compounds 35 are isostructural and show a 2D structure constructed of 1D polyoxometalate chains of [Ln(H2O)22-P2W17O61)]n7n- linked by Ln3+ ions. Compounds 25 represent the first extended structures formed by lacunary Wells−Dawson anions and trivalent lanthanide ions. The influence of the Ln3+/[α2-P2W17O61]10- ratio on the syntheses of these five compounds has been studied. Furthermore, the fluorescent activity of compound 5 is reported.