Electroanalytical investigation on ligand-disproportionation and -exchange equilibria in nickel(II) and nickel(I) halide phosphine complexes in acetonitrile
作者:Gino Bontempelli、Franco Magno、Maria De Nobili、Gilberto Schiavon
DOI:10.1039/dt9800002288
日期:——
of [NiL2X2] complexes (L = PPh3; X = Cl, Br, or I) at platinum electrodes in acetonitrile solution have been investigated by cyclic voltammetry, controlled-potential electrolysis, and spectrophotometry. The complexes undergo quantitative ligand disproportionation giving ionic species, and the nickel(I) complexes obtained as reduction products exhibit ligand-exchange equilibria. The nickel(0) species
通过循环伏安法,控制电位电解法和分光光度法研究了[NiL 2 X 2 ]配合物(L = PPh 3; X = Cl,Br或I)在乙腈溶液中铂电极上的氧化还原反应。配合物经历定量配体歧化作用,产生离子物种,而镍(I作为还原产物获得的复合物表现出配体交换平衡。在进一步的还原过程中获得的镍(0)物种不参与任何配体交换反应。结果表明,氧化还原过程的可逆性程度明显取决于两个氧化还原伙伴中存在的配体组的性质。讨论了还原电势对卤化物配体性质的依赖性。