Used as a key intermediate in organic synthesis, particularly in the preparation of fluorescent dyes and sensors. Its reactivity allows for the introduction of the benzothiadiazole moiety into larger conjugated systems, making it valuable in the development of optoelectronic materials, including organic semiconductors and light-emitting diodes (OLEDs). Commonly employed in the synthesis of fluorescent probes for bioimaging due to its strong electron-accepting properties and ability to undergo further functionalization via the bromomethyl group. Also utilized in the construction of polymers and small molecules for solar cell applications.