Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/5102
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dc.contributor.authorMelo, J. Seixas de-
dc.contributor.authorSobral, Abílio J. F. N.-
dc.contributor.authorGonsalves, A. M. d'A. Rocha-
dc.contributor.authorBurrows, Hugh D.-
dc.date.accessioned2008-09-01T15:03:59Z-
dc.date.available2008-09-01T15:03:59Z-
dc.date.issued2005en_US
dc.identifier.citationJournal of Photochemistry and Photobiology A: Chemistry. 172:2 (2005) 151-160en_US
dc.identifier.urihttp://hdl.handle.net/10316/5102-
dc.description.abstractA bichromophoric system in which anthracene has been covalently linked to meso-tetrakis(phenyl)porphyrin (TPP) moieties by alkylsulfonamide spacers has been synthesized and fully characterized. A spectroscopic and photophysical study of this system in dimethylformamide (DMF) has been undertaken to study electronic energy transfer between the anthracene and porphyrin units in excited singlet and triplet states. By use of steady-state and time-resolved fluorescence techniques as well as phosphorescence and laser flash phototolysis, it is shown that excitation to either the singlet or triplet states of the anthracene leads to energy transfer to the lower lying S1 and T1 states of TPP group. The efficiency and the rate of energy transfer have been determined. Although the estimated efficiency of the energy transfer process in the singlet manifold is high, the coexistence of fluorescence from both moieties when exciting the anthracene, together with observation of a biexponential decay of the porphyrin fluorescence when excited in the porphyrin Soret band suggest that communication exists between the two chromophores. This is discussed in terms of Förster type energy transfer and geminate radical pair mechanisms, possibly involving nonplanar (between chromophores) excited state geometry. In the flash photolysis studies, only the porphyrin triplet state was observed. The dominance of nonradiative deactivation in the overall decay of the excited singlet and triplet states is indicated.en_US
dc.description.urihttp://www.sciencedirect.com/science/article/B6TGY-4F8TKBN-1/1/5c1f57ef1c3195eb7c6546dfa4f427ffen_US
dc.format.mimetypeaplication/PDFen
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectPorphyrinsen_US
dc.subjectAnthraceneen_US
dc.subjectPhotophysicsen_US
dc.subjectFluorescenceen_US
dc.subjectPhosphorescenceen_US
dc.subjectTriplet stateen_US
dc.subjectSinglet stateen_US
dc.titleSinglet and triplet energy transfer in a bichromophoric system with anthracene covalently linked through sulfonamide to a meso-tetraphenylporphyrinen_US
dc.typearticleen_US
dc.identifier.doi10.1016/j.jphotochem.2004.12.004-
uc.controloAutoridadeSim-
item.fulltextCom Texto completo-
item.grantfulltextopen-
item.languageiso639-1en-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.orcid0000-0001-9708-5079-
crisitem.author.orcid0000-0001-6367-027X-
crisitem.author.orcid0000-0001-9987-7301-
crisitem.author.orcid0000-0003-3127-2298-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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