Voltammetric and spectroscopic study of the manganese-quinizarine-quinaldic acid mixed-ligand complex in dimethylsulfoxide

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dc.contributor.authorBodini, ME
dc.contributor.authordelValle, MA
dc.contributor.authorCaceres, S
dc.date.accessioned2024-01-10T13:09:55Z
dc.date.available2024-01-10T13:09:55Z
dc.date.issued1997
dc.description.abstractThe combination of manganese(II) with quinizarine and the monoanion of quinaldic acid in dimethylsulfoxide yields a soluble deep-blue complex whose Mn-II:Qz(2-):ACQ(-) stoichiometry is 1:1:2. This complex is oxidized in two steps each involving one equivalent of charge per metal ion as indicated by controlled-potential electrolyses at +0.30 V vs S.C.E. and +0.45 V vs S.C.E. The association between the metal ion and the ligands prevails and the oxidations produce finally a dark-red complex of the same stoichiometry as the original deep-blue species. In the latter the metal is in the oxidation state +3 and the quinizarine dianion has been oxidized to the semiquinone form. The monoanion of quinaldic acid is unchanged.
dc.description.abstractThe combination of the semiquinone of quinizarine with Mn-II and quinaldic acid yields a species in which the metal ion presents magnetic characteristic of manganese((III)) and the semiquinone has been reduced to the dianion of quinizarine, indicating that intramolecular charge-transfer has occurred.
dc.description.abstractThe voltammetric behaviour of the Mn-III-semiquinone-quinaldic acid complex and its electrochemical reduction indicate that it is binuclear which upon reduction at -0.20 V vs S.C.E, generates a Mn-II-Mn-III mixed-valence species. The latter is in turn reduced at -0.95 V vs S.C.E. producing probably a mononuclear species of Mn-II. (C) 1997 Elsevier Science Ltd.
dc.fechaingreso.objetodigital2024-04-11
dc.format.extent6 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/S0277-5387(97)00062-4
dc.identifier.issn0277-5387
dc.identifier.urihttps://doi.org/10.1016/S0277-5387(97)00062-4
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/77713
dc.identifier.wosidWOS:A1997XF71800001
dc.information.autorucQuímica;Bodini M;S/I;99293
dc.information.autorucQuímica;Del Valle M;S/I;54928
dc.issue.numero17
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final2908
dc.pagina.inicio2903
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.revistaPOLYHEDRON
dc.rightsacceso restringido
dc.subjectmanganese
dc.subjectmixed-ligand complex
dc.subjectsemiquinone
dc.subjectPhotosystem II
dc.subjectquinizarine
dc.subjectquinaldic acid
dc.subjectOXYGEN-EVOLVING COMPLEX
dc.subjectWATER-OXIDIZING ENZYME
dc.subjectREDOX CHEMISTRY
dc.subjectPHOTOSYSTEM-II
dc.subjectEVOLUTION
dc.subjectMONONUCLEAR
dc.subjectBINUCLEAR
dc.subjectCENTERS
dc.titleVoltammetric and spectroscopic study of the manganese-quinizarine-quinaldic acid mixed-ligand complex in dimethylsulfoxide
dc.typeartículo
dc.volumen16
sipa.codpersvinculados99293
sipa.codpersvinculados54928
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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