Synthesis And Partial Characterization Of Ladder And Quinoxaline-based Co-fluorene Low Bandgap Polymers

Thiophene-phenylene-thiophene fused heteroarene ladder-type monomeric unitrnwhich hinders “chain folding” and allows extended conjugation was synthesizedrnalong with two variants of quinoxaline-based donor-acceptor monomeric units.rnSubsequently the copolymerization between these monomeric units andrnpreviously synthesized 2,2'-(9,9-dioctyl-9H-fluorene-2,7-diyl)bis(4,4,5,5-rntetramethyl-1,3,2-dioxaborolane) was effected by a modified Suzukirnpolymerization methodology. The copolymers were partially characterized usingrnUV-vis absorption spectroscopy in both thin film and as chloroform solution,rncyclic voltammetry and fluorescence spectroscopy, for their bandgap andrnquantum yield. The results from the electrochemical and spectroscopic analysisrnrevealed a bandgap of 2.4, 2.1, and 1.9 eV for polymers 53, 54 and 55,rnrespectively.

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