Used primarily in bioconjugation and protein labeling, it serves as a crosslinking agent to attach biomolecules like proteins or peptides to other molecules or surfaces. Its diphenylphosphino group enables efficient coupling reactions, particularly in the synthesis of phosphine-based ligands for catalysis. It is also employed in the preparation of functionalized nanoparticles and polymers for biomedical applications, such as drug delivery systems and diagnostic tools. Additionally, it plays a role in surface modification for biosensors, enhancing their sensitivity and specificity.