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- Title
A soluble phosphorus-centered Keggin polyoxoniobate with bicapping vanadyl groups.
- Authors
Son, Jung-Ho; Ohlin, C André; Johnson, Rene L; Yu, Ping; Casey, William H
- Abstract
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 (31)P and (51)V 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.
- Publication
Chemistry (Weinheim an der Bergstrasse, Germany), 2013, Vol 19, Issue 16, p5191
- ISSN
1521-3765
- Publication type
Journal Article
- DOI
10.1002/chem.201204563