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Journal of Coordination Chemistry
Year: 2008  |  Volume: 61  |  Issue: 18  |  Page No.: 2853 - 2860

Syntheses and crystal structures of two compounds based on saturated keggin-type polyoxotungstates and mixed ligands

Jingxin Meng, Xinlong Wang, Ying Ma, Enbo Wang and Xinxin Xu    

Abstract: Two new polyoxotungstates with dafo and 4,4`-bipy ligands, [Ag(dafo)2]2{[Ag(4,4`-bipy)]2SiW12O40} (1) and [Cd2(dafo)4(4, 4`-bipy)(H2O)2](dafo) SiW12O40 (2) (dafo = 4, 5-diazafluoren-9-one, 4,4`-bipy = 4,4`-bipyridine), have been hydrothermally synthesized and characterized by elemental analyses, IR, TG and single crystal X-ray diffraction. Compound 1 consists of a one-dimensional (1D) chain constructed from [Ag(4,4`-bipy)]+ cations. With the connection of [Ag(4,4`-bipy)]+ cations and α-[SiW12O40]4- anions, two-dimensional (2D) structure was built. Because of the π-π stacking interactions between pyridyl rings of 4,4`-bipy from adjacent chains, three-dimensional (3D) structure was generated. Furthermore, the C-H ... O weak interaction between [Ag(dafo)2]24+ and polytungstate made the structure more stable. Like 1, compound 2 is a three-dimensional (3D) supramolecular compound constructed from a transition-metal complex fragment [Cd2(dafo)4(4,4`-bipy)(H2O)2]4+, SiW12O404- and free dafo through C-H ... O weak interactions. To our best knowledge, it is the first time that saturated Keggin-type polyoxotungstates interact with dafo and 4,4`-bipy at the same time.

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