Abstract
Polycondensation of 1,2,4,5-tetrafluorobenzene (1) with 3,3′-dihexyl-2,2′-bithiophene via Pd/Ag dual-catalyzed cross-dehydrogenative coupling was examined. In situ deprotonation-metalation of 1 with Ag salt proceeded smoothly at 25 °C, and the subsequent transmetalation with a Pd catalyst provided a cross-coupling product. The sequential one-pot two-step reaction method effectively suppressed undesired homo-coupling defects during polymerization. The obtained highly regioregular polymer had a packing structure and exhibited strong fluorescence in the film state, which was also evaluated for use as an emitting material in organic light-emitting diodes.
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