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The state of ruthenium in nitric acid solutions treated with sodium nitrite has been studied by 14 N, 15 N, 17 O, and 99 Ru NMR. In the acidity range 2.7-0.12 mol/L, the dominating ruthenium species are the [RuNO(NO 2 ) 2 (NO 3 )(H 2 O) 2 ] 0 and [RuNO(NO 2 ) 2 (H 2 O) 3 ] + complexes. When the acidity is decreased to 0.06 mol/L, trinitro-and tetranitronitrosoruthenium(II) complexes predominate in solution. In an acidic medium, the trinitro-and tetranitronitrosoruthenium(II) complexes exhibit catalytic activity toward oxidation with air of nitrite to nitrate.
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Emel’yanov et al. (2006) studied this question.
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