Used in organic synthesis, particularly in the preparation of fluorene-based compounds for optoelectronic materials such as organic light-emitting diodes (OLEDs) and semiconductors. Serves as a building block in pharmaceuticals and agrochemicals due to its rigid aromatic structure. Also employed in the development of fluorescent probes and dyes, where its conjugated system enhances photostability and emission properties. Its carboxylic acid functionality allows for easy derivatization, enabling incorporation into polymers and metal-organic frameworks (MOFs) for sensing or catalytic applications.