Used as a key ligand in coordination chemistry, particularly in the synthesis of luminescent ruthenium and iridium complexes for applications in organic light-emitting diodes (OLEDs) and dye-sensitized solar cells (DSSCs). Its ethynyl group allows for further functionalization via click chemistry or Sonogashira coupling, enabling the construction of extended π-conjugated systems. Also employed in catalysis, where it stabilizes transition metal catalysts in cross-coupling reactions. Due to its rigid structure and strong metal-binding ability, it is valuable in the development of molecular sensors and metallo-supramolecular architectures.