Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/33627

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Title
Electrospray ionisation mass spectroscopic characterisation of isopolyoxo-niobates and -tantalates
Author/Creator
Sahureka, Frans;  Burns, Robert C.;  von Nagy-Felsobuki, Ellak I.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
The electrospray ionisation mass spectrometric (ESI MS) characterisation of potassium isopolyoxo-niobate and -tantalate solutions (at pH 11, 10⁻³ M), including the mixed Nb/Ta oxometalate system, primarily yields ions that are based on the M₆O₁₉ moiety (with some protonation of most species being evident). In both positive ion and negative ion modes, moieties of the form [AmM₆O₁₉]ⁿ±, [AmM₆O₁₈]ⁿ±, [AmM₆O₁₇]ⁿ± and [AmM₆O₁₆]ⁿ⁻ (with A=H and/or K, M=Nb and/or Ta) are evident, with the last three types of species being derived from a formal [M₆O₁₉]⁸⁻ species by the progressive loss of three O²⁻ ions. In negative ion mode, polymeric species containing 4, 8, 10, 12 and 14 metal atoms are also observed in the single metal systems, many of which can be related by {M₂O₅} polymerisation units. Most of these are hydrated species, such as [A₆M₈O₂₄(H₂O)n]²⁻ and [A₃M₁₂O₃₃(H₂O)n]³⁻ (both with M=Nb and Ta), [A₅Ta₁₂O₃₄(H₂O)n]³⁻ and [A₃Nb₁₄O₃₈(H₂O)n]³⁻, and are not observed in the 'mixed' Nb/Ta oxometalate system.
Relation
Inorganica Chimica Acta Vol. 351, p. 69-78
Publisher Link
http://dx.doi.org/10.1016/S0020-1693(03)00058-6
Date
2003
Publisher
Elevier BV
Keyword(s)
isopolyoxoniobates;  isopolyoxotantalates;  electrospray ionisation mass spectrometry
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/33627
Identifier
ISSN:0020-1693
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Subject
"Inorganica Chimica Acta"
 
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