Kinetic Studies of the Reduction of [Co(dmgH)2(py)(Cl)] Revisited: Mechanisms, Products, and Implications

We report on a mechanistic investigation regarding the reduction of [CoIII(dmgH)2­(py)(Cl)] (dmg = dimethylglyoxime) by several complementary techniques. The reduction of [CoIII(dmgH)2­(py)(Cl)] was initiated by either electrochemical, photochemical, or pulse radiolytical techniques, and the corresp...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2014-06, Vol.118 (25), p.4382-4391
Main Authors: Kahnt, Axel, Peuntinger, Katrin, Dammann, Claudia, Drewello, Thomas, Hermann, Ralf, Naumov, Sergej, Abel, Bernd, Guldi, Dirk M
Format: Article
Language:English
Subjects:
Dimerization
Mass spectrometry
Photochemical
Physical chemistry
Rate constants
Reduction
Spectroscopy
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Summary:We report on a mechanistic investigation regarding the reduction of [CoIII(dmgH)2­(py)(Cl)] (dmg = dimethylglyoxime) by several complementary techniques. The reduction of [CoIII(dmgH)2­(py)(Cl)] was initiated by either electrochemical, photochemical, or pulse radiolytical techniques, and the corresponding products were analyzed by ESI mass spectrometry. In addition, all of the rate constants for each step were determined. We have found solid experimental as well as theoretical evidence for the appearance of a dinuclear complex [CoIICoIII­(dmgH)4­(py)2­(H2O)2]+ to be the final product of reduction, implying the initially reduced form of [CoIII(dmgH)2­(py)(Cl)] undergoes a dimerization with the starting material in solution.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp501947y