REACTIONS OF NITROPLATINUM COMPLEXES .1. N-15 AND PT-195 NMR-SPECTRA OF PLATINUM(II) NITRITE COMPLEXES

被引:13
作者
APPLETON, TG
BARNHAM, KJ
HALL, JR
MATHIESON, MT
机构
[1] Department of Chemistry, The University of Queensland, Brisbane
关键词
D O I
10.1021/ic00013a010
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
N-15 and Pt-195 NMR spectra have been used to characterize the products of reaction of Pt((NO2)-N-15)4(2-) with sulfamic acid, Pt((NO2)-N-15)3(H2O)- and cis-Pt((NO2)-N-15)2(H2O)2, and the hydroxo complexes Pt((NO2)-N-15)3(OH)2- and cis-Pt((NO2)-N-15)2(OH)2(2-) derived from them by deprotonation. At intermediate pH values, the dinitro complexes rapidly form the hydroxo-bridged compounds [{Pt-((NO2)-N-15)2(mu-OH)}n]n- (n = 2, 3). The acid dissociation constant for Pt((NO2)-N-15)3(H2O)- (pK(a) 5.32) was determined from the variation with pH of delta-N for nitro ligands cis to water/hydroxide. N-15 and Pt-195 NMR parameters were obtained for the series Pt((NO2)-N-15)3Z(m-). The changes in these parameters as Z was changed correlated with those in the series Pt((NH3)-N-15)3Z(n+). Delta-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.
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页码:2751 / 2756
页数:6
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