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https://hdl.handle.net/10316/5138
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. | URI: | https://hdl.handle.net/10316/5138 | DOI: | 10.1016/j.cplett.2004.02.093 | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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