The nitrosodisulphonate anion radical, ·ON(SO3–)2, has been prepared by air oxidation of an equimolar mixture of NaNO2 and NaHSO3 in alkaline aqueous solution; this radical anion, known as Fremy's salt, is a good marker for e.s.r. spectroscopy.
T. Ozawa and T. Kwan, J. Chem. Soc., Chem. Commun., 1985, 54 DOI: 10.1039/C39850000054
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