Used as a key intermediate in the synthesis of conjugated porous organic polymers and covalent organic frameworks (COFs), particularly for applications in gas storage, catalysis, and optoelectronic materials. The aldehyde functional groups enable Schiff base reactions, allowing the construction of extended π-conjugated systems. It is also employed in the development of fluorescent sensors and organic semiconductors due to its rigid aromatic structure and ability to form stable imine linkages. Its ionic nature enhances solubility in polar solvents, facilitating solution-phase synthesis and processing.