Tetraoctylammonium bromide (TOAB) is a quaternary ammonium salt composed of a positively charged tetraoctylammonium cation and a negatively charged bromide anion. It is commonly used as a phase transfer catalyst in organic chemistry to facilitate the transfer of reactants between immiscible phases. This compound also functions as a surfactant and dispersing agent in various industrial applications, such as the production of coatings, adhesives, and polymers. Moreover, the potential use of Tetraoctylammonium bromide in energy storage devices and as an antimicrobial agent has been studied.