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Model compound studies of small bandgap conjugated poly(heteroarylene methines)
Author(s) -
Chen WenChang,
Jenekhe Samson A.
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980401)199:4<655::aid-macp655>3.0.co;2-u
Subject(s) - band gap , polythiophene , conjugated system , polymer , thiophene , oligomer , electron affinity (data page) , materials science , ionization energy , absorption (acoustics) , polymer chemistry , photochemistry , chemistry , ionization , conductive polymer , optoelectronics , organic chemistry , molecule , ion , composite material
Quinoid thiophene oligomers 6 , 7 and 8 were prepared and characterized as model compounds of small bandgap polymers and were shown to have solid state bandgaps in the range of 1.31–2.15 eV and a lowest energy solution optical absorption maximum (λ max ) of 480–676 nm. It was found that the bandgap and ionization potential decrease and electron affinity increases with increasing size of the quinoid oligomer. These results of the model compound studies are in agreement with theoretical predictions for the electronic properties of polythiophene with quinoid geometry and suggest that small bandgap polymers can be achieved by direct incorporation of quinoid structure in the polymer backbone.