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Novel Rare Earth Germanotungstates and Organic Hybrid Derivatives:  Synthesis and Structures of M/[α-GeW11O39] (M = Nd, Sm, Y, Yb) and Sm/[α-GeW11O39](DMSO)

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posted on 04.10.2006, 00:00 by Jing-Ping Wang, Xian-Ying Duan, Xiao-Di Du, Jing-Yang Niu
Five novel polyoxometalate compounds built on the lacunary Keggin-type polyanion [GeW11O39]8- and trivalent rare earth ions (M = Nd, Sm, Y, Yb), [(CH3)4N]2H1.50[Nd1.50(GeW11O39)(H2O)6]·3H2O (1), [(CH3)4N]2H2.25[Sm1.25(GeW11O39) (H2O)4]·3.75H2O (2), [(CH3)4N]2.50H2.50[Y(GeW11O39)(H2O)2]·4H2O (3), [(CH3)4N]2.50H2.50Yb(GeW11O39)(H2O)2]·3.75H2O (4), and [Sm(H2O)7]0.5H0.5[Sm2(GeW11O39)(DMSO)3(H2O)6]·3.5H2O (5) (DMSO = dimethyl sulfoxide) have been synthesized and characterized by elemental analysis, IR and UV spectroscopy, and single-crystal X-ray diffraction. The solid-state structures of compounds 1 and 2 consist of one-dimensional zigzag chains built of [α-GeW11O39]8- anions connected by Nd3+/Sm3+ cations, while the linkage of the building blocks by Y3+/Yb3+ centers in 3 and 4 leads to the formation of linear wires. Compound 5 displays a double-parallel chainlike structure constructed by two linear wires linked by samarium coordination cations.