Synthesis and charge-transport properties of novel π-conjugated polymers incorporating core-extended naphtho[2,1-b:3,4-b′]dithiophene diimides

A novel family of core-extended mellophanic diimide derivatives, named 2,7-dibromobenzo[2,1- b :3,4- b ′]dithiophene diimides, are synthesized for engineering polymeric semiconductors, which show a fine-tunable hole-transporting behavior.