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A Soluble Phosphorus-Centered Keggin Polyoxoniobate with Bicapping Vanadyl Groups
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2013 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 19, no 16, 5191-5197 p.Article in journal (Refereed) Published
Abstract [en]

A water-soluble tetramethylammonium (TMA) salt of a novel Keggin-type polyoxoniobate has been isolated as TMA9[PV2Nb12O42]19H2O (1). This species contains a central phosphorus site and two capping vanadyl sites. Previously only a single example of a phosphorus-containing polyoxoniobate, [(PO2)3PNb9O34]15, was known, which is a lacunary Keggin ion decorated with three PO2 units. However, that cluster was isolated as an insoluble structure consisting of chains linked by sodium counterions. In contrast, the [PV2Nb12O42]9 cluster in 1 is stable over a wide pH range, as evident by 31P and 51V NMR, UV/Vis spectroscopy, and ESI-MS spectrometry. The ease of substitution of phosphate into the central tetrahedral position suggests that other oxoanions can be similarly substituted, promising a richer set of structures in this class.

Place, publisher, year, edition, pages
2013. Vol. 19, no 16, 5191-5197 p.
Keyword [en]
niobium; NMR spectroscopy; phosphorus; polyoxometalates; vanadium
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-129119DOI: 10.1002/chem.201204563OAI: oai:DiVA.org:umu-129119DiVA: diva2:1058644
Available from: 2016-12-21 Created: 2016-12-21 Last updated: 2016-12-21

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Ohlin, C. Andre
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