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

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

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.

Lundin, Angelica,1971Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)angelica (författare)
Lindqvist, Camilla,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)camillal (författare)
Henriksson, Patrik,1983Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)k02hepa (författare)
Steckler, Timothy,1979Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)steckler (författare)
Andersson, Mats,1966Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matsand (författare)
Chalmers tekniska högskola (creator_code:org_t)

Av författaren/redakt...: Kroon, Renee, 19 ...; Lundin, Angelica ...; Lindqvist, Camil ...; Henriksson, Patr ...; Steckler, Timoth ...; Andersson, Mats, ...

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