Abstract
The hydrothermal reactions of Na2WO4·2H2O with secondary metal cation sources in the presence of an appropriate organonitrogen donor yield a series of molecular clusters. The compounds [Ni(bpy)3]1.5[Ni(bpy)2(H2O){H 3W12O40}]·0.5H2O (1·0.5H2O), [{Ni(phen)2(H2O)}2{H4W 12O40}]·4H2O (2.4H2O) and [{Cu(phen)2}4{H2W12O 40}] [{Cu(phen)2}2{H2W12O 40}]·3H2O (4.3H2O) are constructed from the α-metatungstate cluster [H2W12O40]6- core, covalently linked through oxo-bridges to secondary metal-organonitrogen ligand subunits. In the case of 1, the tungstate cluster is decorated by a single {Ni(bpy)2(H2O)}2+ subunit yielding an anionic bimetallic cluster, while in 2, two {Ni(phen)2(H2O)}2+ moieties are linked to the tungstate core to form a neutral bimetallic cluster. It is noteworthy that 4 is constructed of a cationic cluster, exhibiting a central tungstate core linked to four {Cu(phen)2}2+ units, and an anionic bimetallic polyoxoanion, featuring a tungstate core bonded to two {Cu(phen)2}2+ moieties. Compound 3, [{Cu(bpy)2}2W10O32]·2H 2O (3.2H2O) consists of two {Cu(bpy)2}2+ subunits linked to the opposite sides of a decatungstate cluster, while compound 5 contains {Co(bpy)3}3+ cations and the common Keggin anion, [CoW12O40]6-.
Original language | English (US) |
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Pages (from-to) | 150-156 |
Number of pages | 7 |
Journal | Inorganica Chimica Acta |
Volume | 348 |
DOIs | |
State | Published - May 15 2003 |
Keywords
- Bimetallic oxide clusters
- Copper tungstate
- Hydrothermal synthesis
- Nickel tungstate
- Polyoxotungstates
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry