Near-infrared emissive donor-acceptor-type molecules containing thiazole-fused benzothiadiazole as an electron-acceptor moiety

Abstract

Two donor-acceptor-type (D-A-type) molecules containing thiazole-fused benzothiadiazole (BT) as the acceptor moiety were designed and synthesized. The thiazole-fused BT skeleton enables fine-tuning of the solubility and the electronic structure as well as two-dimensional extension of the π-conjugation. The combination with common donor units such as diphenylaminothiophene or triphenylamine-substituted thiophene resulted in the formation of D-A-D-type molecules, which exhibited fluorescence in the NIR region.