On leave from: Department of Analytical Chemistry, Nutrition and Food Science, University of La Laguna, 38071 La Laguna, Tenerife, Spain.
Laser desorption/ionization and laser ablation synthesis of new selenium oxide compounds from selenium(IV) dioxide
Article first published online: 15 FEB 2006
Copyright © 2006 John Wiley & Sons, Ltd.
Rapid Communications in Mass Spectrometry
Volume 20, Issue 6, pages 1019–1024, 30 March 2006
How to Cite
Špalt, Z., Peña-Méndez, E. M., Alberti, M. and Havel, J. (2006), Laser desorption/ionization and laser ablation synthesis of new selenium oxide compounds from selenium(IV) dioxide. Rapid Commun. Mass Spectrom., 20: 1019–1024. doi: 10.1002/rcm.2403
- Issue published online: 15 FEB 2006
- Article first published online: 15 FEB 2006
- Manuscript Accepted: 20 JAN 2006
- Manuscript Revised: 16 JAN 2006
- Manuscript Received: 1 DEC 2005
- Ministry of Education, Youth and Sports. Grant Number: MSM0021622411
Laser desorption/ionization (LDI) and/or laser ablation (LA) of selenium dioxide crystals or its mixtures with sodium peroxide were studied using a commercial matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometer. It was found that LDI and LA of selenium (IV) dioxide not only ionizes SeO2, but also leads to the formation of several positively and negatively singly charged species: SeO (n = 0–2), Se, SeO (n = 0–4), Se2O (n = 3–7), Se3O (n = 4–9), Se4O (n = 8–10). A rather high yield of selenium species in the positive ion mode, Se (m = 1–8) and SemOH+ (m = 3–7), was obtained by using the MALDI approach while the species detected in the negative ion mode, SeO (n = 0–4), Se2O (n = 3–7), Se3O (n = 4–9), and Se4O (n = 9, 10), were the same as those observed during LDI/LA of selenium dioxide. The addition of sodium peroxide to selenium dioxide with the aim of enhancing its oxidation and thus increasing the production of SeO4 product resulted in extensive cationization of the species with sodium or potassium. The following positively and negatively charged species were identified: Se+, Se, Se2OH+, Se2ONa+, SeO (n = 0–3), and Se2O (n = 0, 1, 4). Also observed in mass spectra of such mixtures, various mixed sodium and/or potassium adducts with selenium oxide species, e.g. Se2O4K2Na−, were identified. In all, 26 totally new species, Se2O (n = 3–6), Se3O (n = 4–9), Se4O (n = 8–10), Se4O11H, Se4O12H, Se2O4Na−, Se2O5HNa−, Se2O5HNa, Se3O6K2Na−, Se3O6K2Na, Se2ONa+, and SemOH+ (m = 3–7), were described for the first time. Also, for the first time, the formation of selenium(IV) diperoxide, O-O-Se-O-O or O2SeO2, is described. The stoichiometries of the compounds generated were confirmed using isotopic pattern modeling. Copyright © 2006 John Wiley & Sons, Ltd.