Largely π-extended thienoacenes with internal thieno[3,2-b]thiophene substructures: synthesis, characterization, and organic field-effect transistor applications.

Two largely π-extended thienoacenes with internal thieno[3,2-b]thiophene substructures, i.e., bis[1]benzothieno[2,3-d;2',3'-d']benzo[1,2-b;4,5-b']dithiophene (BBTBDT) and bis(naphtho[2,3-b]thieno)[2,3-d;2',3'-d']benzo[1,2-b;4,5-b']dithiophene (BNTBDT), were synthesized, characterized, and evaluated as an active layer in thin-film organic field-effect transistors.