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Title: The effect of substitution and isomeric imperfection on the photophysical behaviour of p-phenylenevinylene trimers
Authors: Melo, J. Seixas de 
Pina, J. 
Burrows, H. D. 
Brocke, S. 
Herzog, O. 
Thorn-Csányi, E. 
Issue Date: 2004
Citation: Chemical Physics Letters. 388:4-6 (2004) 236-241
Abstract: Spectroscopic 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.
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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