Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/5138
Title: The effect of substitution and isomeric imperfection on the photophysical behaviour of p-phenylenevinylene trimers
Authors: Seixas de Melo, J. 
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: http://hdl.handle.net/10316/5138
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat
file69066893ad2a4fa6bd329e07c35c5dc8.pdf291.9 kBAdobe PDFView/Open
Show full item record

Page view(s)

168
checked on Sep 17, 2019

Download(s)

48
checked on Sep 17, 2019

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.