Browsing by Author "Bogale, Fiseha"

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    Synthesis and Partial Characterization of Ladder and Quinoxaline-Based Co-Fluorene Low Bandgap Polymers
    (Addis Ababa Universty, 2009-07) Bogale, Fiseha; Mammo, Wendimagegn (Professor)
    Thiophene-phenylene-thiophene fused heteroarene ladder-type monomeric unit which hinders “chain folding” and allows extended conjugation was synthesized along with two variants of quinoxaline-based donor-acceptor monomeric units. Subsequently the copolymerization between these monomeric units and previously synthesized 2,2'-(9,9-dioctyl-9H-fluorene-2,7-diyl)bis(4,4,5,5- tetramethyl-1,3,2-dioxaborolane) was effected by a modified Suzuki polymerization methodology. The copolymers were partially characterized using UV-vis absorption spectroscopy in both thin film and as chloroform solution, cyclic voltammetry and fluorescence spectroscopy, for their bandgap and quantum yield. The results from the electrochemical and spectroscopic analysis revealed a bandgap of 2.4, 2.1, and 1.9 eV for polymers 53, 54 and 55, respectively.