Abstract
Regioregular poly(thiophene) derivatives with liquid crystal moiety, poly(3-[2-(4-fluorobenzyloxyethyl)]thiophene) (HT-PFBET) and poly(3-[2-benzyloxyethyl]thiophene) (HT-PBET), were synthesized using cross-coupling reaction according to the Rieke method. Thermochromism of HT-PFBET and HT-PBET was studied by electronic absorption measurements. HT-PFBET gave rise to a clear isosbestic point, while HT-PBET exhibited no isosbestic point with increasing temperature. This is due to a morphological effect induced by fluorine atoms.
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