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dc.contributor.author
Martino, Debora Marcela
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dc.contributor.author
van Willigen, H.
dc.date.available
2017-11-07T18:39:02Z
dc.date.issued
2000-10
dc.identifier.citation
Martino, Debora Marcela; van Willigen, H.; Energy and Electron Transfer Quenching of Porphyrins by C60; American Chemical Society; Journal of Physical Chemistry A; 104; 46; 10-2000; 10701-10707
dc.identifier.issn
1089-5639
dc.identifier.uri
http://hdl.handle.net/11336/27761
dc.description.abstract
Energy- and electron-transfer from porphyrins in the triplet excited state to C60 in toluene and benzonitrile has been studied with Fourier transform EPR (FT-EPR). Pulsed-laser excitation of the systems magnesium tetraphenylporphyrin (MgTPP)/C60 and free-base octaethylporphyrin (OEP)/C60 in toluene gives rise to a resonance peak from C60 triplets (3C60) generated primarily by the energy-transfer process 3MgTPP (3OEP) + C60 -> MgTPP (OEP) + 3C60 as evident from the emissive spin polarization of the 3C60 signal observed at early times. No FT-EPR signals from redox products could be detected. In benzonitrile, triplet energy transfer from 3MgTPP or 3OEP to C60 is a minor process. In this polar solvent photoexcitation of MgTPP/C60 produces FT-EPR spectra with signal contributions from MgTPP+ and C60- in addition to the 3C60 resonance. From the spin polarization and time profile of the signal from the anion radical, it can be deduced that the primary route of electron transfer is oxidative quenching of the porphyrin triplets, 3MgTPP (3OEP) + C60 -> MgTPP+ (OEP+) + C60-. The reduction in 3C60 lifetime indicates that C60- is generated as well by the reductive triplet quenching reaction 3C60 + MgTPP (OEP) -> C60- + MgTPP+ (OEP+).
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Chemical Society
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject.classification
Otras Ciencias Químicas
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dc.subject.classification
Ciencias Químicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Energy and Electron Transfer Quenching of Porphyrins by C60
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-11-03T20:26:46Z
dc.journal.volume
104
dc.journal.number
46
dc.journal.pagination
10701-10707
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Martino, Debora Marcela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; Argentina
dc.description.fil
Fil: van Willigen, H.. UniVersity of Massachusetts at Boston; Estados Unidos
dc.journal.title
Journal of Physical Chemistry A
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/jp002680y
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