Synthesis, Properties, and Semiconducting Characteristics of Bisbenzothieno[ b ]-Fused BODIPYs.

A novel family of bisbenzothieno[ b ]-fused BODIPYs containing seven fused aromatic rings has been developed from readily available benzothieo[3,2- b ]pyrroles through an efficient two-step synthetic route, exhibiting planar skeletons with excellent photostabilities, deep-red absorptions, and near-infrared emissions (up to 753 nm). Importantly, the thin-film transistors based on BTB with a meso -dimethylamino-phenyl group exhibit unipolar n -type charge transporting characteristics with a high electron mobility of 0.013 cm 2 V -1 s -1 .