Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysis

Autores
Dell'Arciprete, María Laura; Cobos, Carlos Jorge; Furlong, Jorge Javier Pedro; Mártire, Daniel Osvaldo; González, Mónica Cristina
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The kinetics of the oxidation of pyridine, 3-chloropyridine, 3-cyanopyridine, 3-methoxypyridine and 3-methylpyridine mediated by SO₄; radicals are studied by flash photolysis of peroxodisulphate, S₂O₈²⁻−, at pH 2.5 and 9. The absolute rate constants for the reactions of both, the basic and acid forms of the pyridines, are determined and discussed in terms of the Hammett correlation. The monosubstituted pyridines react about 10 times faster with sulphate radicals than their protonated forms, the pyridine ions. The organic intermediates are identified as the corresponding hydroxypyridine radical adducts and their absorption spectra compared with those estimated employing the time-dependent density functional theory with explicit account for bulk solvent effects. A reaction mechanism which accounts for the observed intermediates and the pyridinols formed as products is proposed.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Laboratorio de Estudio de Compuestos Orgánicos
Materia
Química
kinetics
oxidation
pyridine
flash photolysis
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/159380
Acceder
id SEDICI_f219a84eb06d41da23544f81f63aaecf
oai_identifier_str oai:sedici.unlp.edu.ar:10915/159380
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysisDell'Arciprete, María LauraCobos, Carlos JorgeFurlong, Jorge Javier PedroMártire, Daniel OsvaldoGonzález, Mónica CristinaQuímicakineticsoxidationpyridineflash photolysisThe kinetics of the oxidation of pyridine, 3-chloropyridine, 3-cyanopyridine, 3-methoxypyridine and 3-methylpyridine mediated by SO₄<M>; radicals are studied by flash photolysis of peroxodisulphate, S₂O₈²⁻−, at pH 2.5 and 9. The absolute rate constants for the reactions of both, the basic and acid forms of the pyridines, are determined and discussed in terms of the Hammett correlation. The monosubstituted pyridines react about 10 times faster with sulphate radicals than their protonated forms, the pyridine ions. The organic intermediates are identified as the corresponding hydroxypyridine radical adducts and their absorption spectra compared with those estimated employing the time-dependent density functional theory with explicit account for bulk solvent effects. A reaction mechanism which accounts for the observed intermediates and the pyridinols formed as products is proposed.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasLaboratorio de Estudio de Compuestos Orgánicos2007info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf2498-2505http://sedici.unlp.edu.ar/handle/10915/159380enginfo:eu-repo/semantics/altIdentifier/issn/1439-4235info:eu-repo/semantics/altIdentifier/issn/1439-7641info:eu-repo/semantics/altIdentifier/doi/10.1002/cphc.200700456info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-22T17:22:36Zoai:sedici.unlp.edu.ar:10915/159380Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 17:22:36.724SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysis
title Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysis
spellingShingle Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysis
Dell'Arciprete, María Laura
Química
kinetics
oxidation
pyridine
flash photolysis
title_short Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysis
title_full Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysis
title_fullStr Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysis
title_full_unstemmed Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysis
title_sort Reactions of sulphate radicals with substituted pyridines: a structure–reactivity correlation analysis
dc.creator.none.fl_str_mv Dell'Arciprete, María Laura
Cobos, Carlos Jorge
Furlong, Jorge Javier Pedro
Mártire, Daniel Osvaldo
González, Mónica Cristina
author Dell'Arciprete, María Laura
author_facet Dell'Arciprete, María Laura
Cobos, Carlos Jorge
Furlong, Jorge Javier Pedro
Mártire, Daniel Osvaldo
González, Mónica Cristina
author_role author
author2 Cobos, Carlos Jorge
Furlong, Jorge Javier Pedro
Mártire, Daniel Osvaldo
González, Mónica Cristina
author2_role author
author
author
author
dc.subject.none.fl_str_mv Química
kinetics
oxidation
pyridine
flash photolysis
topic Química
kinetics
oxidation
pyridine
flash photolysis
dc.description.none.fl_txt_mv The kinetics of the oxidation of pyridine, 3-chloropyridine, 3-cyanopyridine, 3-methoxypyridine and 3-methylpyridine mediated by SO₄<M>; radicals are studied by flash photolysis of peroxodisulphate, S₂O₈²⁻−, at pH 2.5 and 9. The absolute rate constants for the reactions of both, the basic and acid forms of the pyridines, are determined and discussed in terms of the Hammett correlation. The monosubstituted pyridines react about 10 times faster with sulphate radicals than their protonated forms, the pyridine ions. The organic intermediates are identified as the corresponding hydroxypyridine radical adducts and their absorption spectra compared with those estimated employing the time-dependent density functional theory with explicit account for bulk solvent effects. A reaction mechanism which accounts for the observed intermediates and the pyridinols formed as products is proposed.
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas
Laboratorio de Estudio de Compuestos Orgánicos
description The kinetics of the oxidation of pyridine, 3-chloropyridine, 3-cyanopyridine, 3-methoxypyridine and 3-methylpyridine mediated by SO₄<M>; radicals are studied by flash photolysis of peroxodisulphate, S₂O₈²⁻−, at pH 2.5 and 9. The absolute rate constants for the reactions of both, the basic and acid forms of the pyridines, are determined and discussed in terms of the Hammett correlation. The monosubstituted pyridines react about 10 times faster with sulphate radicals than their protonated forms, the pyridine ions. The organic intermediates are identified as the corresponding hydroxypyridine radical adducts and their absorption spectra compared with those estimated employing the time-dependent density functional theory with explicit account for bulk solvent effects. A reaction mechanism which accounts for the observed intermediates and the pyridinols formed as products is proposed.
publishDate 2007
dc.date.none.fl_str_mv 2007
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/159380
url http://sedici.unlp.edu.ar/handle/10915/159380
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1439-4235
info:eu-repo/semantics/altIdentifier/issn/1439-7641
info:eu-repo/semantics/altIdentifier/doi/10.1002/cphc.200700456
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
2498-2505
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 12.982451

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