Radical oxidation of nickel(II) complexes of tetra-azamacrocyclic ligands and the reactions of the resulting nickel(III) complexes: a pulse-radiolysis and flash-photolysis study
Oxidation of tetraaza macrocyclic complexes of nickel(II) with peroxobisulfate ions
作者:S. V. Rosokha、Ya. D. Lampeka
DOI:10.1007/bf00534421
日期:——
oxidation of some tetraazamacrocycliccomplexes of nickel (II) with peroxobisulfate ions in perchloric and sulfuric acid solutions. A scheme of the processes taking place has been proposed and the activation parameters of the reactions determined. The influence of different factors (pH value, ionic strength of the solution, temperature) on the kinetic parameters of the oxidation reactions has been studied
分光光度法已用于研究镍 (II) 的某些四氮杂大环配合物与过硫酸氢根离子在高氯和硫酸溶液中的氧化动力学。已经提出了发生的过程的方案并确定了反应的活化参数。研究了不同因素(pH 值、溶液的离子强度、温度)对氧化反应动力学参数的影响。已经注意到复合物中大环配体的构象对过程速率的显着影响。
Kinetic and spectroscopic observations on the azidyl, , radical oxidation of fac-(Lspectator)ReI(CO)3(Lacceptor) to fac-(Lspectator)ReII(CO)3(Lacceptor), Lspectator=4,4′-bpy; Lacceptor=dipyridyl[3,2-a:2′3′-c]phenazine or Lspectator=Cl−; Lacceptor=bathocuproindisulfonate: A revisitation to the self-exchange rate constants of the and Re(II)/Re(I) couples and to the redox potential of the radical
作者:G.T. Ruiz、M.P. Juliarena、E. Wolcan、G. Ferraudi
DOI:10.1016/j.ica.2007.02.049
日期:2007.9
The oxidation of two triscarbonyl fac-(L-spectator)Re-I(CO)(3)(L-acceptor)(z) complexes (L-spectator = 4,4'-bpy; L-acceptor = dipyridyl[3,2-a:2'3'-c] phenazine (dppz) and z = + or L-spectator = Cl-; L-acceptor = bathocuproinedisulfonate (bcds(2-)) and z = 2-) by azidyl radicals, N-3(.), was investigated by pulse radiolysis. Reaction rate constants were determined for the electron transfer reactions between the Re(II) products and reductants, Ru(bipy)(3)(3+) and Ni(Me-6-[14]dieneN(4))(2+), and used for the calculation of the self-exchange rate constant of the Re(II)/Re(I) couples. The self-exchange rate constants, k similar to 10(7) M-1 s(-1), were one order of magnitude larger than the constant, k similar to 10(6) M-1 s(-1), communicated in the literature for the [Re(DMPE)(3)](+/2+) (DMPE = 1,2-bis(dimethylphosphine)ethane). The larger rate constants of the triscarbonyl complexes are in agreement with the smaller inner sphere reorganization energy of the complexes relative to [Re(DMPE)(3)](+/2+). Moreover, the study demonstrated that the redox potential of the azidyl radicals is E-N3(/N3).(-0) = 1.70 V versus NHE, a value larger than one communicated earlier, and that the self-exchange rate constant of the N-3(.)/N-3(-) couple is k(N3)(/N3)(.)(-) = 2.7 x 10(6) M-1 s(-1). The small value of the N-3(.)/N-3(-) self-exchange rate constant has been related to the large solvent reorganization energy of the reaction. (C) 2007 Elsevier B.V. All rights reserved.
Macartney, Donal H.; McAuley, Alexander; Olubuyide, Olesegun A., Inorganic Chemistry, 1985, vol. 24, # 3, p. 307 - 312
作者:Macartney, Donal H.、McAuley, Alexander、Olubuyide, Olesegun A.
DOI:——
日期:——
Macartney, Donal H.; Mak, Samuel, Canadian Journal of Chemistry, 1992, vol. 70, # 1, p. 39 - 45