Spectral and Kinetic Study of 3-Styrylquinoxalin-2(1<i>H</i>)-ones Photoreduced by <i>N</i>-Phenylglycine and Amines

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dc.contributor.authorDiaz-Hernandez, Dafne
dc.contributor.authorCanete, Alvaro
dc.contributor.authorPavez, Lynda
dc.contributor.authorPerez-Sanhueza, Alberto
dc.contributor.authorGunther, German
dc.contributor.authorSzreder, Tomasz
dc.contributor.authorDe la Fuente, Julio R.
dc.date.accessioned2025-01-23T21:15:23Z
dc.date.available2025-01-23T21:15:23Z
dc.date.issued2019
dc.description.abstractThe photoreduction by amines and N-phenyl-glycine, NPG, of six styrylquinoxalin-2(1H)-ones derivatives substituted in the styryl moiety, R-SQ was studied by using flash photolysis. The photoreaction is initiated via a single electron transfer from the electron donor (amines or NPG) to R-SQ excited triplet state, R-3-SQ*, with the formation of a triplet state radical ion pair or a charge transfer exciplex, (3)[CRIP/CTE]. These species live longer than the respective R-3-SQ* and have very similar transient spectra. In the presence of NPG, these (3)[CRIP/CTE] evolve on mu s time scale to the respective hydrogenated radicals, R-SQH(center dot), whose transient spectra and reaction rate constants with NPG are reported. The identity of these hydrogenated radicals was supported by the spectra obtained with the alpha-H donor triethylamine and previous pulse radiolysis studies in 2-propanol. Our findings allow proposing a radical chain reaction mechanism that explains the observed spectral behavior and rationalizes formation of the main product formed by binding of four PhNHCH2 center dot derived from NPG decarboxylation.
dc.description.funderFONDECYT
dc.fuente.origenWOS
dc.identifier.doi10.1021/acs.jpcb.9b01950
dc.identifier.issn1520-6106
dc.identifier.urihttps://doi.org/10.1021/acs.jpcb.9b01950
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101084
dc.identifier.wosidWOS:000466989000015
dc.issue.numero17
dc.language.isoen
dc.pagina.final3698
dc.pagina.inicio3688
dc.revistaJournal of physical chemistry b
dc.rightsacceso restringido
dc.subject.ods03 Good Health and Well-being
dc.subject.odspa03 Salud y bienestar
dc.titleSpectral and Kinetic Study of 3-Styrylquinoxalin-2(1<i>H</i>)-ones Photoreduced by <i>N</i>-Phenylglycine and Amines
dc.typeartículo
dc.volumen123
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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