Formation and Dissociation of Tetrahedral Nickel(II) and Cobalt(II) Complexes of ?Dithioimidodiphosphato? Ligands, Measurement of Kinetically Determined Stability Constants, and Kinetic Investigations of the Rapid Formation of Tetrahedral Bis(ligand)copper(II) Complexes and Their Rates of Reduction to Trinuclear Copper(I) Species
作者:Peter Moore、William Errington、Satindra?P. Sangha
DOI:10.1002/hlca.200590055
日期:2005.4
Ni2+ complexes dissociate more slowly than the analogous Co2+ species, in all cases, the Co2+ complexes are more stable than those of Ni2+ due to their larger formation rate constants (Table 3). Reactions of Cu2+ with eight ligands HL (R1 to R4=alkyl, alkoxy, aryl, and aryloxy) show that formation of intensely colored tetrahedral [CuIIL2] species is too fast be measured with the available stopped-flow
使用了停流技术测量四面体[ML的形成和解离的速率2 ]配合物(M 2+ =倪2+或Co 2+ 4米的二齿的)s 2端供体“dithioimidodiphosphato”配位体L -(HL = 25.0°在MeOH / H 2 O中的[R 1 R 2 P(S)] NH [P(S)R 3 R 4 ],R 1至R 4 =烷基)95:5(v / v)溶液,并在MOPS(= 3-(吗啉-4-基)丙烷-1-磺酸)或2,6-lutidine(= 2,6-二甲基吡啶)缓冲液中存在。对于L = L 3(R 1= R 2= Me(),由动力学确定的[ML] +离子(M = Ni或Co)的平衡形成常数为10 -5 K= 0.50±0.01或1.64±0.07 l mol -1。CH 2)2 CH(Me)中,R 3 = R 4 =我2 CH),1.27±0.02 7.93或±0.09升摩尔-1为L = L 7(R