STUDY OF THE IRON CATECHIN COMPLEXES IN DIMETHYL SULPHOXIDE. REDOX CHEMISTRY AND INTERACTION WITH SUPEROXIDE RADICAL ANION IN THIS MEDIUM

The redox chemistry of catechin (catH2) and its iron complexes has been studied in dimethyl sulphoxide. In the absence of base a one-to-one iron(II)-catechin complex is formed which exhibits oxidation processes at 0.28 , 0.66, and 0.92 V vs SCE. These processes correspond to the oxidation of Fe(II)...

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Autores principales:	BODINI,MARIO E, DEL VALLE,M. A., TAPIA,RICARDO, LEIGHTON,FEDERICO, GONZALEZ,LORENA
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2001
Materias:	catechin antioxidants iron complexes superoxide dimethyl sulphoxide
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000300011
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spelling	oai:scielo:S0366-164420010003000112002-02-05STUDY OF THE IRON CATECHIN COMPLEXES IN DIMETHYL SULPHOXIDE. REDOX CHEMISTRY AND INTERACTION WITH SUPEROXIDE RADICAL ANION IN THIS MEDIUMBODINI,MARIO EDEL VALLE,M. A.TAPIA,RICARDOLEIGHTON,FEDERICOGONZALEZ,LORENA catechin antioxidants iron complexes superoxide dimethyl sulphoxide The redox chemistry of catechin (catH2) and its iron complexes has been studied in dimethyl sulphoxide. In the absence of base a one-to-one iron(II)-catechin complex is formed which exhibits oxidation processes at 0.28 , 0.66, and 0.92 V vs SCE. These processes correspond to the oxidation of Fe(II) to Fe(III) , the formation of the quinonic form of the catechol moiety and the oxidation of another hydroxy group to a radical. In the presence of base a stable 1:1 complex is formed with oxidation processes that show up at +0.25, +0.64, and +0.88 V vs SCE. The voltammetric and spectroscopic characterization of the species produced after the oxidation processes is described. Upon interaction of the complex with superoxide radical anion in dimethyl sulphoxide, the basic character of this radical anion causes the formation of the monoanion of catechin leading to a more stable complex of iron(II). The protonated superoxide disproportionates to molecular oxygen and peroxide, causing the oxidation of the metal ion. The addition of a second equivalent of superoxide oxidizes bound catechin to the corresponding semiquinone. The formation of hydroxy radicals through Fenton chemistry does not take place because peroxide is consumed and the metal ion remains as a stable iron(III) complexinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaBoletín de la Sociedad Chilena de Química v.46 n.3 20012001-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000300011en10.4067/S0366-16442001000300011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	catechin antioxidants iron complexes superoxide dimethyl sulphoxide
spellingShingle	catechin antioxidants iron complexes superoxide dimethyl sulphoxide BODINI,MARIO E DEL VALLE,M. A. TAPIA,RICARDO LEIGHTON,FEDERICO GONZALEZ,LORENA STUDY OF THE IRON CATECHIN COMPLEXES IN DIMETHYL SULPHOXIDE. REDOX CHEMISTRY AND INTERACTION WITH SUPEROXIDE RADICAL ANION IN THIS MEDIUM
description	The redox chemistry of catechin (catH2) and its iron complexes has been studied in dimethyl sulphoxide. In the absence of base a one-to-one iron(II)-catechin complex is formed which exhibits oxidation processes at 0.28 , 0.66, and 0.92 V vs SCE. These processes correspond to the oxidation of Fe(II) to Fe(III) , the formation of the quinonic form of the catechol moiety and the oxidation of another hydroxy group to a radical. In the presence of base a stable 1:1 complex is formed with oxidation processes that show up at +0.25, +0.64, and +0.88 V vs SCE. The voltammetric and spectroscopic characterization of the species produced after the oxidation processes is described. Upon interaction of the complex with superoxide radical anion in dimethyl sulphoxide, the basic character of this radical anion causes the formation of the monoanion of catechin leading to a more stable complex of iron(II). The protonated superoxide disproportionates to molecular oxygen and peroxide, causing the oxidation of the metal ion. The addition of a second equivalent of superoxide oxidizes bound catechin to the corresponding semiquinone. The formation of hydroxy radicals through Fenton chemistry does not take place because peroxide is consumed and the metal ion remains as a stable iron(III) complex
author	BODINI,MARIO E DEL VALLE,M. A. TAPIA,RICARDO LEIGHTON,FEDERICO GONZALEZ,LORENA
author_facet	BODINI,MARIO E DEL VALLE,M. A. TAPIA,RICARDO LEIGHTON,FEDERICO GONZALEZ,LORENA
author_sort	BODINI,MARIO E
title	STUDY OF THE IRON CATECHIN COMPLEXES IN DIMETHYL SULPHOXIDE. REDOX CHEMISTRY AND INTERACTION WITH SUPEROXIDE RADICAL ANION IN THIS MEDIUM
title_short	STUDY OF THE IRON CATECHIN COMPLEXES IN DIMETHYL SULPHOXIDE. REDOX CHEMISTRY AND INTERACTION WITH SUPEROXIDE RADICAL ANION IN THIS MEDIUM
title_full	STUDY OF THE IRON CATECHIN COMPLEXES IN DIMETHYL SULPHOXIDE. REDOX CHEMISTRY AND INTERACTION WITH SUPEROXIDE RADICAL ANION IN THIS MEDIUM
title_fullStr	STUDY OF THE IRON CATECHIN COMPLEXES IN DIMETHYL SULPHOXIDE. REDOX CHEMISTRY AND INTERACTION WITH SUPEROXIDE RADICAL ANION IN THIS MEDIUM
title_full_unstemmed	STUDY OF THE IRON CATECHIN COMPLEXES IN DIMETHYL SULPHOXIDE. REDOX CHEMISTRY AND INTERACTION WITH SUPEROXIDE RADICAL ANION IN THIS MEDIUM
title_sort	study of the iron catechin complexes in dimethyl sulphoxide. redox chemistry and interaction with superoxide radical anion in this medium
publisher	Sociedad Chilena de Química
publishDate	2001
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000300011
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STUDY OF THE IRON CATECHIN COMPLEXES IN DIMETHYL SULPHOXIDE. REDOX CHEMISTRY AND INTERACTION WITH SUPEROXIDE RADICAL ANION IN THIS MEDIUM

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