Poly (3-octylfuran) has been synthesized with three regioregularities: P3OF-95, P3OF-75, and P3OF-50, where the number signifies the percentage HT content. The 95% HT material is highly crystalline with a structure similar to that of HT-poly (3-octylthiophene), P3OT. The lamellar spacing is 22.1 Å and the π-stacking distance is 3.81 Å. UV-vis spectroscopy reveals that P3OF-95 is aggregated in CHCl3 solution, and solid films of P3OF-95, but not ...