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Multicomponent Polyanions, 49: A Potentiometric and (31P, 51V) NMR Study of the Aqueous Molybdovanadophosphate System
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
2000 (English)In: European Journal of Inorganic Chemistry, Vol. 7, 1509-21 p.Article in journal (Refereed) Published
Abstract [en]

The equilibrium speciation of the quaternary system H+/MoO42-/HVO42-/HPO42- in aqueous 0.600 M Na(Cl) at 25 °C and 90 °C was studied by pH potentiometry and 31P (202.5 MHz) and 51V (131.6 MHz) NMR spectrometry. The study focused on solutions containing the oxoanion components in the ratios (Mo + V)/P = 12:1 and Mo/V 3.8, in the pH range 0-5, wherein Keggin anions of the formula [HzMo12-xVxPO40](3+x-z)- with x = 1-3 are the predominant species. Formation constants (log ) and pKa values for Keggin anions with x = 1-3 were determined from 31P and 51V resonance chemical shift data, 31P resonance intensity data, and pH potentiometric data with the multidata least squares calculation program LAKE. The [Mo11VPO40]4- anion does not protonate, [Mo10V2PO40]5- anions can be monoprotonated, and [Mo9V3PO40]6- anions can be triprotonated. The six most intense 31P NMR resonances of [HzMo9V3PO40](6 - z)- could be followed over the pH range studied. It was also possible to assign some 31P resonances to a specific isomer of [Mo9V3PO40]6-.

Place, publisher, year, edition, pages
2000. Vol. 7, 1509-21 p.
Keyword [en]
Polyoxometalates, Phosphorus, Vanadium, Potentiometry, Formation constants
Identifiers
URN: urn:nbn:se:umu:diva-8974DOI: doi:10.1002/1099-0682(200007)2000:7<1509::AID-EJIC1509>3.0.CO;2-7OAI: oai:DiVA.org:umu-8974DiVA: diva2:148645
Available from: 2008-02-25 Created: 2008-02-25 Last updated: 2011-01-14Bibliographically approved

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Andersson, IngegärdPettersson, Lage

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