Used as a key ligand in coordination chemistry, particularly in the synthesis of metal complexes for catalysis and photophysical applications. Its aldehyde group allows for further functionalization, enabling the creation of advanced materials such as sensors, dyes, and molecular devices. Commonly employed in the development of luminescent ruthenium or iridium complexes used in organic light-emitting diodes (OLEDs) and solar cells. Also applied in supramolecular chemistry to build metallo-cages and switches due to its strong tridentate binding capability with transition metals.