Used as a key intermediate in organic synthesis, particularly in the preparation of fluorescent sensors and molecular probes due to its extended conjugated system and ability to chelate metal ions. Its hydroxyl and aldehyde functional groups allow for easy modification, making it suitable for developing chemosensors that detect metals or small molecules in environmental and biological systems. Also employed in the construction of metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) for applications in catalysis and sensing. Shows potential in optoelectronic devices because of its light-emitting properties and structural rigidity.