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Substituent effects on direct arylation polycondensation and optical properties of alternating fluorene-thiophene copolymers.
- Source :
-
Chinese Journal of Polymer Science (Springer Science & Business Media B.V.) . May2015, Vol. 33 Issue 5, p783-791. 9p. - Publication Year :
- 2015
-
Abstract
- Four thiophene derivatives were prepared by replacing the 3,4 positions of thiophene by -OCH, -CH -COOCH and -CN, respectively. The polycondensations via direct arylation took place between the four thiophene derivatives and 2,7-dibromo-9,9-dioctylfluorene under six various catalytic conditions to investigate the substituent effects. The substituent can affect the electron cloud density of the active C-H bond, which can be monitored by the NMR chemical shift. The experimental results show that the reactivity decreases with increasing the chemical shift of active C-H bonds in the four thiophene derivatives, and thus can promote the direct arylation polycondensation. This phenomenon is explained by the electrophilic aromatic substitution (SAr) mechanism. UV-Visible absorption and photoluminescence were studied to investigate the substituent effect on optical properties of the four copolymers. The results show that these alternating fluorene-thiophene copolymers with different substituents are good fluorescent materials and promising in PLED applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02567679
- Volume :
- 33
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Chinese Journal of Polymer Science (Springer Science & Business Media B.V.)
- Publication Type :
- Academic Journal
- Accession number :
- 101622204
- Full Text :
- https://doi.org/10.1007/s10118-015-1555-9