Synthesis of azadehydrobenzoannulenes exhibiting exceptional luminescence performance

Abstract

Herein, a family of cyclic electron donor-acceptor structures was synthesized and characterized, in which carbazole was used as the donor integrated into dehydrobenzoannulene (DBA). Subsequent solvent-dependent fluorescence spectra revealed that all resultant azaDBAs exhibited pronounced intramolecular charge transfer properties. Benefiting from this unique electron-delocalized architecture, all resulting azaDBAs demonstrated strong and stable electrochemiluminescence emission in the visible region. Finally, an azaDBAc-based epinephrine sensor was developed, enabling ultrasensitive detection for both the early diagnosis of neurodegenerative diseases and dynamical monitoring of neurotransmitters.