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Cartwright, L.; Yi, H.; Iraqi, A. (2016)
Publisher: Royal Society of Chemistry
Languages: English
Types: Article
Herein, we report the synthesis of a series of fluorinated dithienyl carbazole-alt-benzothiadiazoles\ud (PCDTBT analogues) and the characterisation of their optical, electrochemical, thermal and molecular\ud organisation in the solid state. The polymers were decorated with fluorine on either the\ud benzothiadiazole unit, carbazole unit or both to yield PCDTffBT, PCffDTBT and PCffDTffBT, respectively.\ud The copolymers displayed decomposition temperatures in excess of 350 1C. PCDTffBT, PCffDTBT and\ud PCffDTffBT displayed optical band gaps of 1.86, 1.82 and 1.88 eV, respectively. It was speculated this\ud was a consequence of the higher molecular weight of PCffDTBT relative to the other polymers.\ud PCffDTBT and PCffDTffBT displayed shallower HOMO levels relative to PCDTffBT; a consequence of\ud fluorinating the carbazole-donor moiety. XRD studies confirmed that fluorinating the benzothiadiazoleacceptor\ud moiety improves molecular ordering by promoting p–p stacking of polymer backbones in solid\ud state. Interestingly, fluorinating the carbazole-donor unit does not improve p–p stacking of polymer\ud backbones.
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