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dc.contributor.authorMelo, J. Seixas de-
dc.contributor.authorPina, J.-
dc.contributor.authorBurrows, H. D.-
dc.contributor.authorBrocke, S.-
dc.contributor.authorHerzog, O.-
dc.contributor.authorThorn-Csányi, E.-
dc.identifier.citationChemical Physics Letters. 388:4-6 (2004) 236-241en_US
dc.description.abstractSpectroscopic and photophysical properties of two p-phenylenevinylene (PV) trimers, 2,5-substituted diheptyl-(p-phenylenevinylene) and di-[(2-ethylhexyl)oxy]-(p-phenylenevinylene), were studied using absorption spectroscopy, fluorescence and laser flash photolysis. The change from alkyl to alkyloxy groups red-shifts the absorption and fluorescence bands. The rate of internal conversion is independent of the substitution, whereas alkyloxy substitution increases the S1 [rightwards wave arrow] T1 intersystem crossing rate by an order of magnitude. The relevance for the behaviour of conjugated PPV polymers is discussed. For diheptyl-PV, a sample having ca. 3% of the cis-configuration was also studied. Comparison between the all-trans and the cis-contaminated samples revealed no significant differences in their photophysical properties.en_US
dc.titleThe effect of substitution and isomeric imperfection on the photophysical behaviour of p-phenylenevinylene trimersen_US
item.fulltextCom Texto completo-
item.grantfulltextopen- de Ciências e Tecnologia, Universidade de Coimbra- de Ciências e Tecnologia, Universidade de Coimbra- de Ciências e Tecnologia, Universidade de Coimbra- de Coimbra- de Coimbra- de Coimbra- Chemistry Center- Chemistry Center- Chemistry Center-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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