Strategic Capture of the {Nb7} Polyoxometalate |
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| Authors: | Dr Nicolas P Martin Enric Petrus Dr Mireia Segado Ana Arteaga Dr Lev N Zakharov Dr Carles Bo Dr May Nyman |
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| Institution: | 1. Department of Chemistry, Oregon State University, Gilbert Hall, Corvallis, Oregon, 97331 USA;2. Institut Catalá dInvestigació Química (ICIQ), The Barcelona Institute of Science and Technology, Av. Paísos Catalans 17, Tarragona, 43007 Spain |
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| Abstract: | Group V Nb-polyoxometalate (Nb-POM) chemistry generally lacks the elegant pH-controlled speciation exhibited by group VI (Mo, W) POM chemistry. Here three Nb-POM clusters were isolated and structurally characterized; Nb14O40(O2)2H3]14?, ((UO2)(H2O))3Nb46(UO2)2O136H8(H2O)4]24?, and (Nb7O22H2)4(UO2)7(H2O)6]22?, that effectively capture the aqueous Nb-POM species from pH 7 to pH 10. These Nb-POMs illustrate a reaction pathway for control over speciation that is driven by counter-cations (Li+) rather than pH. The two reported heterometallic POMs (with UO22+ moieties) are stabilized by replacing labile H2O/HO?Nb=O with very stable O=U=O. The third isolated Nb-POM features cis-yl-oxos, prior observed only in group VI POM chemistry. Moreover, with these actinide-heterometal contributions to the burgeoning Nb-POM family, it now transects all major metal groups of the periodic table. |
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| Keywords: | heptaniobate niobium polyoxometalates polyoxoniobate uranyl |
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