caa a22 4500 475847709 CHVBK 20180406123919.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1023/A:1009098627616 doi (NATIONALLICENCE)springer-10.1023/A:1009098627616 Electrospray Mass Spectrometry of Aqueous Solutions of Isopolyoxotungstates [Elektronische Daten] [Daud Walanda, Robert Burns, Geoffrey Lawrance, Ellak von Nagy-Felsobuki] Electrospray mass spectrometry (ESMS) has been conducted on aqueous solutions of isopolyoxotungstate systems. There is direct evidence that the desorption process in the ESMS technique has resulted in significant chemical effects, resulting in the detection of many new anions and cations. For the ammonium polyoxotungstate system, negative-ion ESMS yields ions of the form [HW m O3m+1]−, [W m O3m+1]2−, and [HW m O3m+2]3− (with the latter being better formulated as [H2W2m O6m+4]6−). For the alkali metal polyoxotungstate systems ions of the form [W m O3m+1A]− and [W m O4m A2m−2]2− (where A=Li+, Na+, K+) were observed. For positive-ion ESMS two series were observed, namely, the [W m O4m A2m+1]+ and [W m O4m A2m+2]2+ ions. In the ammonium polyoxotungstate system, aggregates of both the [HW m O3m+1]− and the [W m O3m+1]2− series can be classified as open-chained structures of tetrahedra that are corner shared, whereas the more highly charged anions [H2W2m O6m+4]6− are consistent with closed-packed structures which are based on the structure of paratungstate-B [H2W12O42]10−. For the alkali metal tungstate systems, the ESMS spectra are consistent with open-chained structures of octahedral units that are edge shared, with a terminating tetrahedral unit. Linear correlations suggest that the assembly of these aggregates occurs via an additive polymerization mechanism for which the additive moieties (WO3, WO2+ 2, and W2O8A4) in aqueous solution can be identified. Plenum Publishing Corporation, 2000 electrospray mass spectrometry nationallicence isopolyoxotungstates nationallicence polymerization mechanism of polytungstates nationallicence alkali metal polyoxotungstates nationallicence tungsten clusters nationallicence Walanda Daud Department of Chemistry, The University of Newcastle, 2308, Callaghan, NSW, Australia aut Burns Robert Department of Chemistry, The University of Newcastle, 2308, Callaghan, NSW, Australia aut Lawrance Geoffrey Department of Chemistry, The University of Newcastle, 2308, Callaghan, NSW, Australia aut von Nagy-Felsobuki Ellak Department of Chemistry, The University of Newcastle, 2308, Callaghan, NSW, Australia aut Journal of Cluster Science Kluwer Academic Publishers-Plenum Publishers 11/1(2000-03-01), 5-28 1040-7278 11:1<5 2000 11 10876 https://doi.org/10.1023/A:1009098627616 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1009098627616 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Walanda Daud Department of Chemistry, The University of Newcastle, 2308, Callaghan, NSW, Australia aut NATIONALLICENCE 700 1- Burns Robert Department of Chemistry, The University of Newcastle, 2308, Callaghan, NSW, Australia aut NATIONALLICENCE 700 1- Lawrance Geoffrey Department of Chemistry, The University of Newcastle, 2308, Callaghan, NSW, Australia aut NATIONALLICENCE 700 1- von Nagy-Felsobuki Ellak Department of Chemistry, The University of Newcastle, 2308, Callaghan, NSW, Australia aut NATIONALLICENCE 773 0- Journal of Cluster Science Kluwer Academic Publishers-Plenum Publishers 11/1(2000-03-01), 5-28 1040-7278 11:1<5 2000 11 10876 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer