Used as a key intermediate in the synthesis of functionalized coatings and surface modifiers, particularly for metal oxides and semiconductors. Its phosphonic acid group provides strong anchoring to surfaces like aluminum, titanium, and iron oxides, making it effective in corrosion inhibition and adhesion promotion. The terminal hydroxyl group allows further chemical modification, enabling the creation of hydrophilic layers or coupling with polymers and biomolecules. It is also employed in the development of self-assembled monolayers (SAMs) for sensors and electronic devices, where controlled surface wettability and molecular organization are required. Additionally, it finds use in chelation applications and as a building block in specialty surfactants and dispersants.