Synthesis and Partial Characterization of Ladder and Quinoxaline-Based Co-Fluorene Low Bandgap Polymers
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Date
2009-07
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Addis Ababa Universty
Abstract
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.
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Keywords
Ladder-type