Electrode Kinetics of the Redox Couples of Co(III/II) Complexes with Ethylenediamine-N-acetate, Iminodiacetate, and Diethylenetriamine
- 1 August 1981
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 54 (8) , 2475-2481
- https://doi.org/10.1246/bcsj.54.2475
Abstract
The electrochemical kinetic parameters of Co(edma)21+⁄0 (edma: ethylenediamine-N-acetate), Co(ida)21−⁄2− iminodiacetate), Co(dien)23+⁄2+ (dien: diethylenetriamine), Co(1,2-pn)33+⁄2+ (1,2-pn: 1,2-propanediamine), and Co(gly)30⁄1− (gly: glycinate) redox couples were determined by d.c. and normal pulse polarographic measurements as well as galvanostatic double pulse measurements. A difference in the evaluated kinetic parameters for the geometric isomers, trans(O)- and cis(O)-Co(edma)21+⁄0 and trans(N)- and cis(N)-Co(ida)21−⁄2− couples, was recognized. The values of the standard rate constant for the bis forms with dien, edma, and ida were reduced with increase in the number of replacement of amino groups in dien by carboxyl groups. The standard rate constants of the redox couples of Co(III/II) complexes with a series of bi- and tridentate polyamines and aminocarboxylates increase in proportion to the number of nitrogen donor atoms involved in the ligands.Keywords
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