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• W1679741053 abstract "The reduction of CoIII in the tetraamine-encapsulating ligand complex [CoIII{(μ-ET)(Me2)cyclen}(H2O)2]3+ by [FeII(CN)6]4− has been studied kinetico-mechanistically at different pH, temperatures, and pressures. The process agrees with the expected outer-sphere redox mechanism, with the value of the encounter-complex equilibrium constant large enough to allow for kinetic determination of the first-order electron transfer reaction rate constant. The value of the encounter-complex equilibrium constant, Kpre-eq, is not only dependent on the charge of the redox partners, but also on the establishment of an important network of hydrogen bonds. These can also explain the differences obtained in the activation volumes determined for the diaqua and bis-hydroxo complexes. Neither the leaching of CoII nor the presence of [FeIII(CN)6]3− is observed in the final reaction medium, which indicates that a fast sequence involving substitution on the transient CoII complex followed by a fast inner-sphere electron transfer takes place. This sort of mechanism has already been established for encapsulating pentaamine ligand complexes, but this is the first example of such a sequential reaction occurring on a tetradentate ligand complex. Preliminary UV–Vis and electrochemical characterization experiments have been conducted on the final reaction mixtures, suggesting the formation of a stable cyanide-bridged CoIII/FeII mixed-valence complex of the same type reported in the literature for encapsulating {CoIII(N)5} skeletons." @default.
• W1679741053 created "2016-06-24" @default.
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• W1679741053 date "2015-08-05" @default.
• W1679741053 modified "2023-10-14" @default.
• W1679741053 title "Temperature- and pressure-dependent kinetico-mechanistic studies on the formation of mixed-valence {(tetraamine)Co^IIINCFe^II(CN)₅}⁻ units" @default.
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• W1679741053 doi "https://doi.org/10.1080/00958972.2015.1074190" @default.
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