Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2563
Título: New coumarin-[60] fullerene dyads connected by an alkynyl linkage: Synthesis and fluorescence studies. Evidence for efficient singlet-singlet energy transfer
Autor: Nascimento, Susana
Fedorov, Alexander
Brites, Maria João
Berberan-Santos, M. N.
Palavras-chave: Energy transfer
Electron transfer
Dyads
Fullerene
Chemical properties
Photophysical properties
Data: 2015
Editora: Elsevier
Citação: Nascimento, S.; Fedorov, A.; Brites, M.J.; Berberan-Santos, M.N. - New coumarin-[60] fullerene dyads connected by an alkynyl linkage: Synthesis and fluorescence studies. Evidence for efficient singlet-singlet energy transfer. In: Dyes and Pigments, 2015, Vol. 114, p. 158-165
Resumo: Two new coumarin-[60] fullerene dyads, in which an alkyne group covalently links C60 to coumarin, are synthesized via 1,3-dipolar cycloaddition and spectroscopically characterized. Their photophysical properties in apolar (toluene) and polar (THF and benzonitrile) solvents are studied at room temperature, revealing the nature and polarity dependence of the excited-state interactions between the coumarin and C60 moieties. In both dyads and in all solvents, a strong quenching of the coumarin emission by C60 was observed. It mainly results from a fast and efficient singletesinglet resonance energy transfer from the coumarin moiety to the C60 moiety, but an electron transfer contribution, enhanced in polar solvents, also exists. In toluene, the fluorescence emission of the fullerene moiety is increased by the nonradiative energy transfer process, which occurs mainly by a dipoleedipole (FRET) mechanism. In polar solvents (THF and benzonitrile), fast electron transfer from ground-state coumarin to excited fullerene is significant, leading to a partial or complete quenching of the fullerene emission, depending on the dyad.
URI: http://hdl.handle.net/10400.9/2563
ISSN: 0143-7208
Versão do Editor: http://dx.doi.org/10.1016/j.dyepig.2014.11.005
Aparece nas colecções:ES - Artigos em revistas internacionais

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