Nitrosyl thiocyanate reacted with sufficiently high concentrations of thiocyanate ion to form an adduct, [ON(SCN) 2 ] Ϫ , which absorbs strongly in the UV region. This species has different properties to that species described in the literature as [NO(SCN) 2 ] Ϫ formed in pulse-radiolysis experiments involving (SCN) 2 Ϫ and NO. The difference probably arises from different structures, an S-nitroso as compared to an N-nitroso compound.

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The kinetics of oxidation by Ce IV in sulfuric acid of hydrazine, hydroxylamine, nitrous acid, hydrazoic acid and of an intermediate involved in the nitrite/hydrazine reaction has been examined under a uniform set of conditions. Reaction proceeds through the free base form of the nitrogen substrate, probably by an inner-sphere mechanism, with a reactivity sequenceϪ . An intermediate in the hydrazine/nitrous acid reaction, NH 2 N᎐ ᎐ NOH, is also oxidised by Ce IV in a Ce IV /HNO 2 /N 2 H 5 ϩ system. For the Ce IV /HNO/HN 3 system there is a much larger consumption of oxidant than can be accounted for by the separate oxidations of nitrite and azide. An additional pathway is proposed, probably involving NNN-O-N᎐ ᎐ O, formed by combination of azide and nitrogen dioxide radicals.

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