Abstract
We report the synthesis of oligo(9,9-dioctyl-2,7-diyl)-alt-bithiophenes 4a–e. The molecular weight was tuned by an end-capping reaction with the monofunctional 2-bromo-9,9-di-(n-octyl)-fluorene 2. All oligomers showed nematic mesophases and no sign for crystallisation upon cooling. The clearing temperatures were in the range from 80 to 288°C in oligomers with different molecular weight. A plot of 1/P n versus the clearing temperature resulted in a clearing temperature of 366°C for the ideal polymer. First orientation experiments on rubbed polyimide films gave a maximum orientation of 8.2 to 1 parallel and perpendicular to the rubbing direction.
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