Largely π‑Extended Thienoacenes with Internal Thieno[3,2‑<i>b</i>]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.