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Gutiérrez, M.M.; Almaraz, A.E.; Bari, S.E.; Olabe, J.A.; Amorebieta, V.T. "The HNO donor ability of hydroxamic acids upon oxidation with cyanoferrates(III)" (2015) Journal of Coordination Chemistry. 68(17-18):3236-3246
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Abstract:

The hydroxamic acids (RC(O)NHOH, HA) exhibit diverse biological activity, including hypotensive properties associated with formation of nitroxyl (HNO) or nitric oxide (NO). Oxidation of two HAs, benzohydroxamic and acetohydroxamic acids (BHA, AHA) by [Fe(CN)5NH3]2- or [Fe(CN)6]3- was analyzed by spectroscopic, mass spectrometric techniques, and flow EPR measurements. Mixing BHA with both Fe(III) reactants at pH 11 allowed detecting the hydroxamate radical, (C6H5)C(O)NO-, as a one-electron oxidation product, as well as N2O as a final product. Successive UV-vis spectra of mixtures containing [Fe(CN)5NH3]2- (though not [Fe(CN)6]3-) at pH 11 and 7 revealed an intermediate acylnitroso-complex, [Fe(CN)5NOC(O)(C6H5)]3- (max, 465 nm, very stable at pH 7), formed through ligand interchange in the initially formed reduction product, [Fe(CN)5NH3]3-, and characterized by FTIR spectra through the stretching vibrations (CN), (CO), and (NO). Free acylnitroso derivatives, formed by alternative reaction paths of the hydroxamate radicals, hydrolyze forming RC(O)OH and HNO, postulated as precursor of N2O. Minor quantities of NO are formed only with an excess of oxidant. The intermediacy of HNO was confirmed through its identification as [Fe(CN)5(HNO)]3- (max, 445 nm) as a result of hydrolysis of [Fe(CN)5(NOC(O)(C6H5)]3- at pH 11. The results demonstrate that hydroxamic acids behave predominantly as HNO donors. © 2015 Taylor and Francis.

Registro:

Documento: Artículo
Título:The HNO donor ability of hydroxamic acids upon oxidation with cyanoferrates(III)
Autor:Gutiérrez, M.M.; Almaraz, A.E.; Bari, S.E.; Olabe, J.A.; Amorebieta, V.T.
Filiación:Facultad de Ciencias Exactas y Naturales, Departamento de Química, Universidad Nacional de Mar Del Plata, Mar del Plata, Argentina
Departamento de Química Inorgánica, Analítica y Química Física, INQUIMAE (UBA, CONICET), Buenos Aires, Argentina
Palabras clave:Acylnitroso species; Hydroxamic acids; Nitroxyl; Nitroxyl donor; Pentacyano(L)ferrate(III) oxidants
Año:2015
Volumen:68
Número:17-18
Página de inicio:3236
Página de fin:3246
DOI: http://dx.doi.org/10.1080/00958972.2015.1068938
Título revista:Journal of Coordination Chemistry
Título revista abreviado:J. Coord. Chem.
ISSN:00958972
CODEN:JCCMB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00958972_v68_n17-18_p3236_Gutierrez

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Citas:

---------- APA ----------
Gutiérrez, M.M., Almaraz, A.E., Bari, S.E., Olabe, J.A. & Amorebieta, V.T. (2015) . The HNO donor ability of hydroxamic acids upon oxidation with cyanoferrates(III). Journal of Coordination Chemistry, 68(17-18), 3236-3246.
http://dx.doi.org/10.1080/00958972.2015.1068938
---------- CHICAGO ----------
Gutiérrez, M.M., Almaraz, A.E., Bari, S.E., Olabe, J.A., Amorebieta, V.T. "The HNO donor ability of hydroxamic acids upon oxidation with cyanoferrates(III)" . Journal of Coordination Chemistry 68, no. 17-18 (2015) : 3236-3246.
http://dx.doi.org/10.1080/00958972.2015.1068938
---------- MLA ----------
Gutiérrez, M.M., Almaraz, A.E., Bari, S.E., Olabe, J.A., Amorebieta, V.T. "The HNO donor ability of hydroxamic acids upon oxidation with cyanoferrates(III)" . Journal of Coordination Chemistry, vol. 68, no. 17-18, 2015, pp. 3236-3246.
http://dx.doi.org/10.1080/00958972.2015.1068938
---------- VANCOUVER ----------
Gutiérrez, M.M., Almaraz, A.E., Bari, S.E., Olabe, J.A., Amorebieta, V.T. The HNO donor ability of hydroxamic acids upon oxidation with cyanoferrates(III). J. Coord. Chem. 2015;68(17-18):3236-3246.
http://dx.doi.org/10.1080/00958972.2015.1068938