Abstract
Molecular oxygen reacts with O− on the surface of magnesium oxide to form the ozonide ion, O3−. The EPR spectrum of this ion was used to verify its formation. Oxygen-17 was introduced into the molecule either via the O− ion or the O2 molecule. The spectrum is characterized by g1=2.0172, g2=2.0100, and g3=2.0014, with | a3 a |=26 G, | a3 b |=82 G, and | a3 c |=65 G. Here, a3 a is the hyperfine splitting for the oxygen atom which was originally O−. The splitting along the other principal axes was less than 5 G. A model is suggested in which a terminal oxygen of the bent molecule is in the plane of the surface, and the plane of the molecule is perpendicular to the surface. The ozonide ion slowly dissociated at 25° to form O2−. The oxygen-17 isotope distribution indicates that the superoxide ion was largely derived from molecular oxygen, rather than the O− ion.
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