Effect of Extended Conjugation on the Optoelectronic Properties of Benzo[1,2-d:4,5-d′]bisoxazole Polymers
Brian C. Tlach A , Aimée L. Tomlinson B , Kiley D. Morgan B , Christopher R. Collins B , Michael D. Zenner A and Malika Jeffries-EL A C
+ Author Affiliations
- Author Affiliations
A Department of Chemistry, Iowa State University, Ames IA 50010, USA.
B Department of Chemistry and Biochemistry, University of North Georgia, GA 30597, USA.
C Corresponding author. Email: malikaj@iastate.edu
Australian Journal of Chemistry 67(5) 711-721 https://doi.org/10.1071/CH13528
Submitted: 1 October 2013 Accepted: 4 December 2013 Published: 30 January 2014
Abstract
Four copolymers comprising benzo[1,2-d:4,5-d']bisoxazole (BBO) and benzo[1,2-b:4,5-b′]dithiophene (BDT) bearing phenylethynyl substituents on either the BBO, BDT moieties or both units were synthesised and the influence of two-dimensional conjugation on their optoelectronic properties investigated. Extending conjugation along the BBO resulted in a 0.5 eV decrease in the LUMO level, whereas the HOMO level was raised by 0.2 eV. Extending conjugation across the BDT moiety in also resulted in a 0.5 eV decrease in the LUMO level, however, the effect was negligible on the HOMO level. Thus, cross-conjugation can be used to independently tune the LUMO level within these systems.
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