KINETICS OF THE REDUCTION OF (ETHYLENEDIAMINETETRA-ACETATO)COBALTATE(III) AND RELATED COMPLEXES BY CHROMIUM (II) IONS

Article abstract of DOI:10.1039/DT9810000894

Rate constants of the electon-transfer reactions of three cobalt(III)-edta (edta = ethylenediaminetetra-acetate) complexes with Cr²⁺ have been determined by a stopped-flow spectrophotometric method at 25 deg C and ionic strength of 1.0 mol dm^-3 (Na).The values are (6.6 +- 1.0) x 10³ dm³ mol ^-1 s^-1 for ^-, (7.6 +- 0.4) x 10³ dm³ mol^-1 s^-1 for , and >2 x 10⁶ dm³ mol^-1 s^-1 for ^-.A comparison with other reducing agents 2+, ^4-, and Ti^III> indicates that titanium(III) reduction of the same series of cobalt(III)-edta complexes studied by Marcec and Orhanovic proceeds via outer-sphere mechanism.

Full text of DOI:10.1039/DT9810000894

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