Ligand Exchange Reactions between Phosphonic Acids at TiO2 Nanoparticle Surfaces

摘要

Understanding the surface chemistry of organic-inorganic interfaces is a prerequisite for the design of novel nanohybrid materials. Herein, we disclose that phosphonate ligands tightly bind to TiO2 nanoparticle surfaces and cannot be displaced even through repetitive decantation by methanol. However, 1D 1 H solution NMR analyses unambiguously show that they can be effectively exchanged by other phosphonic acids. A key enabler for successful measurements is the design and syn- thesis of a novel phosphonic acid ligand that stabilizes TiO2 nanoparticles in toluene to form homogeneous colloidal conditions.