Used as a key intermediate in the synthesis of ligands for transition metal catalysts, particularly in coordination chemistry involving ruthenium and iridium complexes. Its aldehyde group allows for easy functionalization, enabling the construction of conjugated systems for use in photovoltaic devices and luminescent materials. Commonly employed in the development of sensors due to its ability to chelate metal ions and produce detectable optical responses. Also applied in the preparation of organic frameworks and functional polymers with tailored electronic properties.