Synthesis And Characterization Of Quinoxqline-fluorene-thiophene Containing Polymers

In the course of this project, the synthesis of polyquinoxaline copolymers wasrnattempted. Monomer 5,7-bis(5-bromothiophen-2-yl)-2,3-bis(5-butylthiophen-3-rnyl)thieno[3,4-b]pyrazine (51) was synthesized successfully. Two copolymersrnbased on quinoxaline and fluorene derivatives were synthesized by using Suzukirncoupling polymerization reaction. These were, poly(2,3-bis-(5-butyl-thiophen-2-rnyl)-5-[5-(9,9-dioctyl-9H-fluorene-2-yl)-thiophen-2-yl]-8-thiophen-2-yl-quinoxaline)rn(59) and poly(2,3-bis-(5-butyl-thiophen-2-yl)-5-[5-(9,9-dibenzyl-9H-fluoren-2-yl)-rnthiophen-2-yl]-8-thiophen-2-yl-quinoxaline) (61). These polymers wererncharacterized by 1H- and 13C-NMR spectra, UV-Vis spectra and cyclicrnvoltammetery. Attempts also made to prepare cyclopentadithiophene startingrnfrom 3-bromothiophen. However, this synthesis was not accomplished

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