Kinetics of the Reductions of (Ethylenediaminetetraacetato)cobaltate(III) by 4,4‐Dipyridylamine Complexes of Pentacyanoferrate(II) and Pentaammineruthenium(II)

Chien, C. K.; Yeh, Andrew

doi:10.1002/jccs.199300022

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…However it has been reported that stable Co(edta) 2-solution can be prepared by mixing equimolar amounts of Co 2+ and edta 4-solutions. 26,37 We therefore believe that the ligand remains intact to the metal center in the reduction of Co(edta) -complex.…”

Section: Kinetics For the Reduction Of Co(iii) Complexesmentioning

confidence: 97%

The Reductions of Bis(terpyridyl) and Ethylenediaminetetraacetato Complexes of Cobalt(III) by Ascorbic Acid

Lin

Huang

et al. 2005

Jnl Chinese Chemical Soc

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The reductions of Co(terpy)2 3+ and Co(edta) -complexes by ascorbic acid have been subjected to a detailed kinetic study in the range of pH = 1-10.9. For each complex the rate law of the reaction is interpreted as a rate determining reaction between Co(III) complex and the ascorbic acid in the form of HA -(k1) and A 2-(k2), depending on the pH of the solution, followed by a rapid scavenge of the ascorbic acid radicals by Co(III) complex. With given Ka1 and Ka 2 , the rate constants are k 1 = 0.25 and 9.87´10-5 M -1 s -1 , k 2 = 1.28´10 6 and 18.7 M -1 s -1 for Co(terpy) 2 3+ and Co(edta) -complexes, respectively, at T = 25°C and m = 0.50 M (terpy) and 1.0 M (edta) HClO4/LiClO4. The mechanism of the reaction is discussed on the basis of Marcus theory for outer sphere electron transfer process. Spin change and charge effect, duly considered, account for the nonadiabatic behavior in the reduction of Co (edta) -complex.

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Section: Kinetics For the Reduction Of Co(iii) Complexesmentioning

confidence: 97%

The Reductions of Bis(terpyridyl) and Ethylenediaminetetraacetato Complexes of Cobalt(III) by Ascorbic Acid

Lin

Huang

et al. 2005

Jnl Chinese Chemical Soc

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Mixed Valence Chemistry of Pyrimidine Bridged Binuclear Complex of Pentacyanoferrate and Pentaammineruthenium

Tsaur

Yen

1994

J Chinese Chemical Soc

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The pyrimidine bridged binuclear complex (CNhFepymRu(NH 3)5' (I) was prepared in aqueous solution by mixing cquimolar of Fe(CN)50H13. and Ru(NH 3)spym;!+. Its mixed valence state molecule (CN)5FepymRu(NHJh(II) was obtained upon oxidation of I by one equivalent of peroxydisulfate ion. Both binuclear complexes and corresponding Fe(II) and Ru(lI) mononuclear complexes displayed a metal-to-ligand charge transfer absorption in 400-450 nm region. Rate constants of formation and dissociation of I and II were measured, and the values of k, (-10 3M· l s· l ) and k.l (-10.

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Oxidations of 4‐ and 3‐Aminopyridinepentaammineruthenium(ii) Complexes by Ethylenediaminetetraacetatocobaltate(III)

Chien

Chen

Yang

et al. 1996

J Chinese Chemical Soc

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Redox reactions of Co(edta)− with Ru(NH3)5L2+ (L = 3‐ and 4‐aminopyridine (AmPy)) were found to follow an outer‐sphere electron transfer mechanism. The specific rate constants are (3.26 ± 0.03) × 102 and (3.07 ± 0.04) × 103 M−1S−1, for L = 3‐ and 4‐AmPy, respectively, at μ, = 0.10 M LiClO4, pH = 8.0 (tris) and T = 25 °C. The rate constants of oxidations for a series of Ru(NH3)5L2+ complexes are higher than those of the corresponding Fe(CN)5L3‐ complexes by factors of 4 to 15 even after corrections for differences in reduction potentials and in charges of the complexes. Nonadiabaticity in the reactions of Fe(CN)5L3 complexes may account for the difference in the relative reactivities.

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Kinetics of the Reductions of (Ethylenediaminetetraacetato)cobaltate(III) by 4,4‐Dipyridylamine Complexes of Pentacyanoferrate(II) and Pentaammineruthenium(II)

Cited by 4 publications

References 30 publications

The Reductions of Bis(terpyridyl) and Ethylenediaminetetraacetato Complexes of Cobalt(III) by Ascorbic Acid

The Reductions of Bis(terpyridyl) and Ethylenediaminetetraacetato Complexes of Cobalt(III) by Ascorbic Acid

Mixed Valence Chemistry of Pyrimidine Bridged Binuclear Complex of Pentacyanoferrate and Pentaammineruthenium

Oxidations of 4‐ and 3‐Aminopyridinepentaammineruthenium(ii) Complexes by Ethylenediaminetetraacetatocobaltate(III)

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