Synthesis Of Low Bandgap Alternating Copolymers Based On Fluorene-quinoxaline And Benzothiadiazole Units

Donor/Acceptor-Copolymers, as so-called “low-band-gap” π-conjugatedrnpolymers, have been widely investigated and applied in different areas such asrnorganic photovoltaics (OPVs), organic light emitting diodes (OLEDs) and organicrnfield effect transistors (OFETs). Due to the attractive features of those functionalrnorganic polymer materials such as light weight, flexibility and low cost ofrnproduction they have attracted recent interest in research development.rnIn the course of this project, the synthesis of polyfluorene copolymers wasrnattempted. Monomers based on quinoxaline, namely, 5,8-bis-(5-bromo-thiophen-rn2-yl-2,3-bis(4-octyloxyphenyl)quinoxaline was successfully synthesized. Tworncopolymers, namely, poly[5-(5-(9,9-bis-[2-(2-methoxy-ethoxy)-ethyl]-7-methyl-9Hfluoren-rn2-yl}-thiophen-2-yl)-8-(5-methyl-thiophen-2-yl)-2,3-bis-(4-octyloxyphenyl)-rnquinoxaline] and poly[5-(5-(7-(7-(9,9-bis-[2-(2-methoxy-ethoxy)-ethyl]-9H-fluoren-rn2-yl)-benzo[1,2,5]thiadiazol-4-yl)-9,9-bis-[2-(2-methoxy-ethoxy)-ethyl]-9H-fluoren-rn2-yl)-thiophen-2-yl)-2,3-bis-(4-octyloxy-phenyl)-8-thiophen-2-yl-quinoxaline].rnWere prepared with a palladium(0)-catalyzed Suzuki-coupling polymerizationrnreaction and the polymers were characterized by NMR, Uv-Vis a

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