Voltammetric study of the redox chemistry of 2,3-dihydroxy-quinoxaline and its zinc complexes in non-aqueous medium

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dc.contributor.authorBodini, ME
dc.contributor.authordel Valle, MA
dc.contributor.authorCopia, GE
dc.contributor.authorSoto, C
dc.date.accessioned2024-01-10T13:09:55Z
dc.date.available2024-01-10T13:09:55Z
dc.date.issued1998
dc.description.abstractThe electrochemical behaviours of 2,3-dihydroxy-quinoxaline (2,3-DH(2)Qx) and the complex species formed with zinc(II) have been studied in non-aqueous media. Using dimethylsulphoxide or N,N-dimethylformamide as solvents the monoanion of the ligand is obtained quantitatively after reduction of one of the hydroxylic protons. The reduction potential for the hydroxylic proton is -1.93 V vs S.C.E. in DMSO and -1.68 V vs S.C.E. in DMF, reflecting the different donor number of the solvents. If acetonitrile is used, the simultaneous reduction of both hydroxylic protons is observed. The oxidation to the semiquinone is observed at -0.12 V us S.C.E. in DMSO and DMF whereas it appears at -0.02 V us S.C.E. in acetonitrile.
dc.description.abstractNeither the protonated ligand nor its quinonic form exhibit the formation of stable complexes with zinc(II) whereas the dianionic species produces two coordination compounds having M:L stoichiometric ratios of 1:1 and 1:2.
dc.description.abstractThe semiquinone form of the ligand by itself shows the tendency to polymerize on the surface of the electrode and it is not stabilized in the presence of this metal ion. A neutral insoluble compound that passivates the electrode is formed when the semiquinone and this metal ion interact. It was not possible to study this complex in detail but the electrochemical evidence indicates that it has formed on the surface of the electrode. (C) 1998 Elsevier Science Ltd. All rights reserved.
dc.fechaingreso.objetodigital2024-04-11
dc.format.extent6 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/S0277-5387(97)00419-1
dc.identifier.issn0277-5387
dc.identifier.urihttps://doi.org/10.1016/S0277-5387(97)00419-1
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/77714
dc.identifier.wosidWOS:000073949000040
dc.information.autorucQuímica;Bodini M;S/I;99293
dc.information.autorucQuímica;Del Valle M;S/I;54928
dc.issue.numero11-12
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final2114
dc.pagina.inicio2109
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.revistaPOLYHEDRON
dc.rightsacceso restringido
dc.subjectzinc
dc.subject2,3-dihydroxy-quinoxaline
dc.subjectcomplexes
dc.subjectaprotic medium
dc.subjectvoltammetry
dc.subjectTRANSITION-METAL COMPLEXES
dc.subjectSPECTROSCOPY
dc.subjectSEMIQUINONE
dc.subjectCATECHOL
dc.subjectLIGANDS
dc.subjectACID
dc.subject.ods07 Affordable and Clean Energy
dc.subject.odspa07 Energía asequible y no contaminante
dc.titleVoltammetric study of the redox chemistry of 2,3-dihydroxy-quinoxaline and its zinc complexes in non-aqueous medium
dc.typeartículo
dc.volumen17
sipa.codpersvinculados99293
sipa.codpersvinculados54928
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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