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• W2031848841 abstract "The reactivity of coordinated nitroxyl (HNO) has been explored with the [Fe(II)(CN)(5)HNO](3-) complex in aqueous medium, pH 6. We discuss essential biorelevant issues as the thermal and photochemical decompositions, the reactivity toward HNO dissociation, the electrochemical behavior, and the reactions with oxidizing and reducing agents. The spontaneous decomposition in the absence of light yielded a two-electron oxidized species, the nitroprusside anion, [Fe(II)(CN)(5)NO](2-), and a negligible quantity of N(2)O, with k(obs)≈5×10(-7)s(-1), at 25.0°C. The value of k(obs) represents an upper limit for HNO release, comparable to values reported for other structurally related L ligands in the [Fe(II)(CN)(5)L](n-) series. These results reveal that the FeN bond is strong, suggesting a significant σ-π interaction, as already postulated for other HNO-complexes. The [Fe(II)(CN)(5)HNO](3-) ion showed a quasi-reversible oxidation wave at 0.32 V (vs normal hydrogen electrode), corresponding to the [Fe(II)(CN)(5)HNO](3-)/[Fe(II)(CN)(5)NO](3-),H(+) redox couple. Hexacyanoferrate(III), methylviologen and the nitroprusside ion have been selected as potential oxidants. Only the first reactant achieved a complete oxidation process, initiated by a proton-coupled electron transfer reaction at the HNO ligand, with nitroprusside as a final oxidation product. Dithionite acted as a reductant of [Fe(II)(CN)(5)HNO](3-), in a 4-electron process, giving NH(3). The high stability of bound HNO may resemble the properties in related Fe(II) centers of redox active enzymes. The very minor release of N(2)O shows that the redox conversions may evolve without disruption of the FeN bonds, under competitive conditions with the dissociation of HNO." @default.
• W2031848841 created "2016-06-24" @default.
• W2031848841 creator A5007090899 @default.
• W2031848841 creator A5038242282 @default.
• W2031848841 creator A5041533077 @default.
• W2031848841 date "2013-01-01" @default.
• W2031848841 modified "2023-10-13" @default.
• W2031848841 title "Reactivity of iron(II)-bound nitrosyl hydride (HNO, nitroxyl) in aqueous solution" @default.
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• W2031848841 doi "https://doi.org/10.1016/j.jinorgbio.2012.10.009" @default.
• W2031848841 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23153690" @default.
• W2031848841 hasPublicationYear "2013" @default.
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