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Kinetics and mechanism of periodate oxidation of two ternary nitrilotriacetatochromium(III) complexes involving histidine and aspartate co-ligands

“…Also, an efficient oxidation of Hantzsch 1,4-dihydropyridines to their corresponding pyridine derivatives with (Bu 4 N)IO 4 catalyzed by [Mn(TPP)Cl] was reported [11]. An inner-sphere mechanism for oxidation of chromium(III) complexes of some amino acids [12,13] and nucleosides [14][15][16] by periodate has been proposed with the hydroxo group acting as bridging ligand, or through the substitution of coordinated H 2 O by [IO 4 ] -.…”

“…Oxidation of ternary nitrilotriacetatocobalt(II) complexes involving succinate, malonate, tartrate, maleate and benzoate as secondary ligands by periodate has been investigated [17][18][19]. In all cases, initial cobalt(III) products were formed, and these changed slowly to the final cobalt(III) products.…”

Inner-sphere oxidation of ternary nitrilotriacetatocobalt(II) complexes involving oxalate and phthalate by periodate

“…where nta(nitrilotriacetic acid) is functioning as a primary ligand and ox (oxalic acid) or ph (phathalic acid) as a secondary ligands. The lability of cobalt(II) reactants and the inertness of cobalt(III) products could be utilized as a diagnostic tool for ascertaining inner-sphere electron transfer [18,24]. Oxidation of some cobalt(II) complexes by periodate, where an initial cobalt (III) product was observed, was interpreted in terms of this mechanism.…”

“…Oxidation of some cobalt(II) complexes by periodate, where an initial cobalt (III) product was observed, was interpreted in terms of this mechanism. An inner-sphere mechanism is proposed for the pathway of oxidation of both two cobalt(II) complexes [Co II (nta)(ox)(H 2 O) 2 ] 3-and [Co II (nta)(ph)(H 2 O) 2 ] 3-by the formation of an initial cobalt (III) products, which were slowly converted to the final cobalt products [18,24,25].…”

“…Oxidation of the binary complex diaqua(nitrilotriacetatocobaltate(II) [Co II nta(H 2 O) 2 ] - [18] and its ternary complexes involving tartaric acid, maleic acid [24] and benzoic acid [25] as secondary ligands by periodate has been studied in aqueous medium. These reactions proceeded via the formation of initial cobalt(III) products, which were converted slowly into final cobalt(III) products fitting an inner-sphere mechanism.…”