Used as a crosslinking agent in polymer chemistry, particularly in the synthesis of conjugated microporous polymers and organic frameworks. Its bifunctional chloromethyl groups readily undergo alkylation reactions, enabling the formation of rigid, extended networks useful in gas storage, catalysis, and optoelectronic materials. Also employed in the preparation of fluorescent dyes and sensors due to its naphthalene backbone, which contributes to π-conjugation and light-emitting properties. Additionally, serves as a building block in supramolecular chemistry for constructing molecular cages and porous organic materials.