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The generation of 2,2′- and 4,4′-dipyridyl anion radicals by adsorption on magnesium oxide was confirmed by means of electron spin resonance and visible spectroscopies. When the adsorbed species were exposed to air, the dipyridyl anion radical faded away and the ESR spectrum which was attributed to the oxygen molecule anion radical was observed.
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Tokio Iizuka (1973) studied this question.
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