Hydrothermal synthesis of polyoxotungstate clusters, surface-modified with M(II)-organonitrogen subunits

R. Nandini Devi, Eric Burkholder, Jon A Zubieta

Research output: Contribution to journalArticle

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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 languageEnglish (US)
Pages (from-to)150-156
Number of pages7
JournalInorganica Chimica Acta
Volume348
DOIs
StatePublished - May 15 2003

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Keywords

  • Bimetallic oxide clusters
  • Copper tungstate
  • Hydrothermal synthesis
  • Nickel tungstate
  • Polyoxotungstates

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

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