Reactions of nitroplatinum complexes. 1. sup 15 N and sup 195 Pt NMR spectra of platinum(II) nitrite complexes

{sup 15}N and {sup 195}Pt NMR spectra have been used to characterize the products of reaction of Pt({sup 15}NO{sub 2}){sub 4}{sup 2{minus}} with sulfamic acid, Pt({sup 15}NO{sub 2}){sub 3}(H{sub 2}O){sup {minus}} and cis-Pt({sup 15}NO{sub 2}){sub 2}(H{sub 2}O){sub 2}, and the hydroxo complexes Pt({sup 15}No{sub 2}){sub 2}(OH){sub 2}{sup 2{minus}} derived from them by deprotonation. At intermediate pH values, the dinitro complexes rapidly form the hydroxo-bridged compounds ({l brace}Pt({sup 15}NO{sub 2}){sub 2}({mu}-OH){r brace}){sup n{minus}} (n = 2,3). The acid dissociation constant for Pt({sup 15}BO{sub 2}){sub 3}(H{sub 2}O){sup {minus}} (pK{sub a} 5.32) was determined from the variation with pH of {delta}{sub N} for nitro ligands cis to water/hydroxide. {sup 15}N and {sup 195}Pt NMR parameters were obtained for the series Pt({sup 15}NO{sub 2}){sub 3}Z{sup m{minus}}. These changes in these parameters as Z was changed correlated with those in the series Pt({sup 15}NH{sub 3}){sub 3}Z{sup n+}. {delta}{sub N} and J(Pt-N) values are much more sensitive to change in the ligand Z for the nitro ligand trans to Z than for that cis to Z. 44 refs., 3 figs., 3 tabs.