reduction of platinum(IV) derivatives. The rate of oxidation of the platinum(II) complexes by FeIII is decreased by the presence of FeII. The results are consistent with a redox mechanism involving two successive one-electron-transfer steps. Changes of ligands are found to influence the kinetic and thermodynamic parameters in the same direction, the oxidation of the platinum(II) complexes being kinetically
可逆系统的动力学和平衡(i)[L = NH 3,NMeH 2,NEtH 2,NPrH 2或½en(en =
乙烯-[PtL 4 ] 2+ + 2Fe 3+ + 2Br - ⇌反式[[ PtL 4 Br 2 ] 2+ + 2Fe 2+(i)(二胺)]已在I = 1.0 mol dm –3的0.50 mol dm –3
高氯酸水溶液中进行了研究。伪一阶速率常数的形式为k obs。= k f [Fe 3+ ] [Br– ] + k f ′[Fe 3+ ] [Br – ] 2用于
氧化铂( II)配合物和k obs。= k r [Fe 2+ ]用于还原
铂( IV)衍
生物。Fe II的存在会降低Fe III对
铂( II)配合物的氧化速率。结果与涉及两个连续的单电子转移步骤的氧化还原机理一致。发现
配体的变化会在相同方向上影响动力学和热力学参数,即
铂的氧化II)以NPrH 2<NEtH 2<NMeH 2<NH