The interaction of molecular oxygen with polycrystalline Bi2O3 was investigated by infrared (IR) and thermogravimetric (TGA) analyses, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). The results indicate the formation of "end-on"and"bridging"superoxide species, which are trapped in theβ-Bi2O3 vacant oxygen sites, Bi(IV) and Bi(V) centres also being produced. O2-interacts with Bi(IV) centres giving two superoxide adducts with temperature-dependent relative amounts,Bi(IV)O2-and Bi(IV)O2-Bi(IV)-O2-Bi(III),both having a triplet spin state.
Barreca, D., Morazzoni, F., Rizzi, G., Scotti, R., Tondello, E. (2001). Molecular oxygen interaction with Bi2O3 : a spectroscopic and spectromagnetic investigation. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 3(9), 1743-1749 [10.1039/B009482J].
Molecular oxygen interaction with Bi2O3 : a spectroscopic and spectromagnetic investigation
MORAZZONI, FRANCA;SCOTTI, ROBERTO;
2001
Abstract
The interaction of molecular oxygen with polycrystalline Bi2O3 was investigated by infrared (IR) and thermogravimetric (TGA) analyses, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). The results indicate the formation of "end-on"and"bridging"superoxide species, which are trapped in theβ-Bi2O3 vacant oxygen sites, Bi(IV) and Bi(V) centres also being produced. O2-interacts with Bi(IV) centres giving two superoxide adducts with temperature-dependent relative amounts,Bi(IV)O2-and Bi(IV)O2-Bi(IV)-O2-Bi(III),both having a triplet spin state.
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