BN Fused Diazulenyl‐Carbazole: Synthesis, Structure, and Properties

Main observation and conclusion By combination of two special structural units, a boron‐nitrogen‐fused polycyclic aromatic hydrocarbon and azulene with strong intramolecular dipoles, a novel BN aromatics, BN‐Az, has been designed and synthesized with unique characteristics. The structure, optical and electrochemical properties, as well as charge transport property of BN‐Az have been investigated. Notably, BN‐Az selectively responds to fluoride ions and protons with a significant color change, which could also be monitored by NMR spectra and single‐crystal X‐ray analysis, indicating its potential as an effective ion sensing material in stimuli‐responsive electronic devices.