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Issue 5, 1988
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An electron spin resonance study of the superoxide radical anion in polycrystalline magnesium oxide and titanium dioxide powders

Abstract

Treatment of a titanium dioxide polycrystalline powder with hydrogen peroxide produces a paramagnetic species with g1= 2.022, g2= 2.010, g3= 2.003. This radical, observed at atmospheric pressure, is proposed to be subsurface O˙–2i.e. the superoxide radical anion. The same species, although with different g values; g1= 2.074, g2= 2.007, g3= 2.002, is found for magnesium oxide (MgO) treated with H2O2. Two further sites for O˙–2 are also indicated by the spectra. Two of these O˙–2 species, similar to those found for the MgO product, are detected in an untreated mixture of 25% MgO2–75% MgO. The concentration of the O˙–2 species in this mixture is increased by γ-irradiation.

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Article type: Paper
DOI: 10.1039/F19888401723
J. Chem. Soc., Faraday Trans. 1, 1988,84, 1723-1728

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    An electron spin resonance study of the superoxide radical anion in polycrystalline magnesium oxide and titanium dioxide powders

    A. Amorelli, J. C. Evans and C. C. Rowlands, J. Chem. Soc., Faraday Trans. 1, 1988, 84, 1723
    DOI: 10.1039/F19888401723

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