Used as a coupling agent in surface modification, particularly for introducing bromine-terminated alkyl chains onto silica or glass surfaces. The trichlorosilane group reacts readily with hydroxyl groups on these surfaces, forming stable siloxane bonds. The bromine end-group allows for further functionalization via nucleophilic substitution or metal-catalyzed coupling reactions, making it valuable in creating tailored interfaces for biosensors, nanotechnology, and organic-inorganic hybrid materials. Commonly employed in the preparation of self-assembled monolayers (SAMs) where controlled surface chemistry is required.