Generation and Detection of Gaseous W12O41-{bullet operator} and Other Tungstate Anions by Laser Desorption Ionization Mass Spectrometry

Julius Pavlov, Washington Braida, Adebayo Ogundipe, Gregory O'Connor, Athula B. Attygalle

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The presence of a peak centered near m/z 2862, observed for the first time for the caged dodecatungstate radical-anion, [W12O41]-{bullet operator}, enables distinguishing WO2 from WO3 by Laser Desorption Ionization mass spectrometry (LDI-MS). In addition to WO2, laser irradiation of dry deposits made from aqueous ammonium paratungstate, and calcium and lead orthotungstate also produce the [W12O41]-{bullet operator}. In contrast, spectra recorded from deposits made from aqueous Na2WO4, sodium metatungstate, and WO3, or non-aqueous calcium and lead orthotungstate, and ammonium paratungstate, failed to show the m/z 2862 peak cluster. These observations support the hypothesis that polycondensation reactions to form [W12O41]-{bullet operator} occur solely in the presence of water. Although dry spots are irradiated for ionization, the solvent used for sample preparation plays an important role on the chemical composition endowed to ions detected. For example, the m/z 2862 peak seen from deposits made from aqueous ammonium paratungstate, and calcium and lead orthotungstate, is absent in the spectra recorded either from pristine deposits or those derived from solutions made with organic solvents such as acetonitrile or ethanol.

Original languageEnglish
Pages (from-to)1782-1789
Number of pages8
JournalJournal of the American Society for Mass Spectrometry
Volume20
Issue number10
DOIs
StatePublished - Oct 2009

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