Effect of electron-withdrawing side chain modifications on the optical properties of thiophene-quinoxaline acceptor based polymers

Kroon, Renee, 1982 (author): Chalmers tekniska högskola,Chalmers University of Technology

Lundin, Angelica, 1971 (author): Chalmers tekniska högskola,Chalmers University of Technology

Lindqvist, Camilla, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology

Henriksson, Patrik, 1983 (author): Chalmers tekniska högskola,Chalmers University of Technology

Steckler, Timothy, 1979 (author): Chalmers tekniska högskola,Chalmers University of Technology

Andersson, Mats, 1966 (author): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

Related links:: http://dx.doi.org/10...; show more...; https://research.cha...; https://doi.org/10.1...; show less...

Abstract Subject headings

Four new thiophene-quinoxaline acceptor based polymers have been synthesized. The parent thiophene-quinoxaline acceptor based copolymer was modified by introducing different electron-withdrawing groups adjacent to the thiophene side group. The effect on the physical, electrochemical and optical properties of the polymer series is discussed with respect to the parent thiophene-quinoxaline acceptor based polymer. The side chain carbonyl from one modified monomer could conveniently be transformed to either a difluoromethylene or an -ylidene malononitrile group via carbonyl transformations. For all polymers incorporating an electron-withdrawing side group both the HOMO and especially the LUMO were significantly shifted away from vacuum while all exhibit enhanced light harvesting ability. Especially the incorporation of an -ylidine malononitrile side group increases both the spectral coverage and absorption coefficient. Incorporation of a difluoromethylene side group resulted in a twofold increase of the molecular weight compared to the parent polymer structure.

By the author/editor: Kroon, Renee, 19 ...; Lundin, Angelica ...; Lindqvist, Camil ...; Henriksson, Patr ...; Steckler, Timoth ...; Andersson, Mats, ...

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