Polyoxometalates (POMs) are defined as anonic metal-oxo clusters consisting of the Group V (V, Nb, and Ta) or Group VI (Mo, W) transition metals.  Compared to the rich and diverse chemsitry from the group VI POMs, polyoxoniopbates (PONb) and polyoxotantalates (POTa) have received considerably less attention, despite of their unique properties and potential applications in radionuclide sequestration, virology, the base-catalyzed decomposition of biocontaminants, and photocatalytic water dissociation.  Here we report a series of highly soluble heteropolyniobates with Cs, Rb, and K as counter-cations. Their solid-state and solution chemistry were investigated by single crystal and powder X-ray diffraction, TGA, NMR, and ESI-MS techniques.  The successful isolation of these compounds show that the anomalous solubility trend ovserved prior for [Nb6O19]8- (Cs-salt most soluble, Li-salt least soluble) is indeed universal for PONb chemistry.  This opens up new possibilities for exploring solubion phase applications and behaviour: especiallythose considered promising for PONb including homogeneous catalysis and microbiological applications.Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Loclheed Martin Corporation, for the U. S. Departemnt of Energy's National Nuclear Security Asministration.

Highly soluble heteropolyniobates

243rd National Meeting (2012)

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