(4-Bromophenyl)phosphonic acid is primarily used in organic synthesis and material science. It serves as a key intermediate in the preparation of various phosphonate derivatives, which are important in the development of pharmaceuticals, agrochemicals, and flame retardants. The compound is also utilized in the synthesis of metal-organic frameworks (MOFs) and coordination polymers, where its phosphonic acid group acts as a robust linker for metal ions, enabling the creation of porous materials with potential applications in gas storage, separation, and catalysis. Additionally, it finds use in surface modification and functionalization, enhancing the properties of materials for specific industrial or technological applications.