Molecular oxygen interaction with Bi2O3: a spectroscopic and spectromagnetic investigation

Authors
Barreca, D Morazzoni, F Rizzi, GA Scotti, R Tondello, E
Citation
D. Barreca et al., Molecular oxygen interaction with Bi2O3: a spectroscopic and spectromagnetic investigation, PHYS CHEM P, 3(9), 2001, pp. 1743-1749
Citations number
45
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN journal
14639076 → ACNP
Volume
3
Issue
9
Year of publication
2001
Pages
1743 - 1749
Database
ISI
SICI code
1463-9076(2001)3:9<1743:MOIWBA>2.0.ZU;2-Y
Abstract
The interaction of molecular oxygen with polycrystalline Bi2O3 was investig ated by infrared (IR) and thermogravimetric (TGA) analyses, X-ray photoelec tron spectroscopy (XPS) and electron paramagnetic resonance (EPR). The resu lts indicate the formation of "end-on'' and "bridging'' superoxide species, which are trapped in the beta -Bi2O3 vacant oxygen sites, Bi(iv) and Bi(v) centres also being produced. O-2(-) interacts with Bi(iv) centres giving t wo superoxide adducts with temperature-dependent relative amounts, Bi(iv)-O -2(-) and Bi(iv)-O-2(-)-Bi(iii), both having a triplet spin state.