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Proceedings Paper

Theoretical study of push-pull molecules based on thiophene oligomers
Author(s): Maria Cristina dos Santos; L. E. Bolivar-Marinez; Douglas S. Galvao
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Paper Abstract

Thiophene oligomers ((alpha) -(alpha) ' linkages) have been intensively studied in past years. In particular, sexithiophenes have been synthesized with a high degree of purity and good crystallinity allowing the fabrication of reliable field effect transistors. When donor- acceptor terminal groups are attached to thiophene oligomers, an anomalous behavior of the fluorescence as a function of the number of rings has been reported. There are experimental evidences of charge transfer suppression for oligomers containing more than four rings. In this work, we investigate the electronic structure of these systems. Geometrical optimizations and spectroscopic features of both ground and excited states are obtained through the use of sophisticated semi-empirical methods. Our results show that charge transfer suppression can be explained in terms of the evolution of the electronic spectrum.

Paper Details

Date Published: 15 September 1995
PDF: 8 pages
Proc. SPIE 2528, Optical and Photonic Applications of Electroactive and Conducting Polymers, (15 September 1995); doi: 10.1117/12.219552
Show Author Affiliations
Maria Cristina dos Santos, Univ. Estadual de Campinas (Brazil)
L. E. Bolivar-Marinez, Univ. Estadual de Campinas (Brazil)
Douglas S. Galvao, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 2528:
Optical and Photonic Applications of Electroactive and Conducting Polymers
Sze Chang Yang; Prasanna Chandrasekhar, Editor(s)

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