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dc.contributor.author
Moore, Gary F.
dc.contributor.author
Hambourger, Michael
dc.contributor.author
Gervaldo, Miguel Andres
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dc.contributor.author
Poluektov, Oleg G.
dc.contributor.author
Rajh, Tijana
dc.contributor.author
Gust, Devens
dc.contributor.author
Moore, Thomas A.
dc.contributor.author
Moore, Ana L.
dc.date.available
2024-07-30T12:44:34Z
dc.date.issued
2008-07
dc.identifier.citation
Moore, Gary F.; Hambourger, Michael; Gervaldo, Miguel Andres; Poluektov, Oleg G.; Rajh, Tijana; et al.; A Bioinspired Construct That Mimics the Proton Coupled Electron Transfer between P680 •+ and the Tyr Z -His190 Pair of Photosystem II; American Chemical Society; Journal of the American Chemical Society; 130; 32; 7-2008; 10466-10467
dc.identifier.issn
0002-7863
dc.identifier.uri
http://hdl.handle.net/11336/241230
dc.description.abstract
A bioinspired hybrid system, composed of colloidal TiO2 nanoparticles surface modified with a photochemically active mimic of the PSII chlorophyll-Tyr-His complex, undergoes photoinduced stepwise electron transfer coupled to proton motion at the phenolic site. Low temperature electron paramagnetic resonance studies reveal that injected electrons are localized on TiO2 nanoparticles following photoexcitation. At 80 K, 95% of the resulting holes are localized on the phenol moiety and 5% are localized on the porphyrin. At 4.2 K, 52% of the holes remain trapped on the porphyrin. The anisotropic coupling tensors of the phenoxyl radical are resolved in the photoinduced D-band EPR spectra and are in good agreement with previously reported g-tensors of tyrosine radicals in photosystem II. The observed temperature dependence of the charge shift is attributed to restricted nuclear motion at low temperature and is reminiscent of the observation of a trapped high-energy state in the natural system. Electrochemical studies show that the phenoxyl/phenol couple of the model system is chemically reversible and thermodynamically capable of water oxidation.
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
TIO2
dc.subject
PROTON
dc.subject
ELECTRON
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
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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
A Bioinspired Construct That Mimics the Proton Coupled Electron Transfer between P680 •+ and the Tyr Z -His190 Pair of Photosystem II
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-07-24T13:19:40Z
dc.journal.volume
130
dc.journal.number
32
dc.journal.pagination
10466-10467
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Moore, Gary F.. Arizona State University; Estados Unidos. Argonne National Laboratory; Estados Unidos
dc.description.fil
Fil: Hambourger, Michael. Arizona State University; Estados Unidos. Argonne National Laboratory; Estados Unidos
dc.description.fil
Fil: Gervaldo, Miguel Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Arizona State University; Estados Unidos. Argonne National Laboratory; Estados Unidos
dc.description.fil
Fil: Poluektov, Oleg G.. Arizona State University; Estados Unidos. Argonne National Laboratory; Estados Unidos
dc.description.fil
Fil: Rajh, Tijana. Arizona State University; Estados Unidos. Argonne National Laboratory; Estados Unidos
dc.description.fil
Fil: Gust, Devens. Arizona State University; Estados Unidos. Argonne National Laboratory; Estados Unidos
dc.description.fil
Fil: Moore, Thomas A.. Arizona State University; Estados Unidos. Argonne National Laboratory; Estados Unidos
dc.description.fil
Fil: Moore, Ana L.. Arizona State University; Estados Unidos. Argonne National Laboratory; Estados Unidos
dc.journal.title
Journal of the American Chemical Society
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.acs.org/doi/10.1021/ja803015m
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/ja803015m
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