This presentation focuses on the study of organohalide reactions at cesium lead halide (CsPbX3, X = Cl, Br, I) perovskite nanoparticle (NP) surfaces with diffusion and relaxation ordered NMR spectroscopic techniques (DOSY and ROSY). CsPbX3 NPs are of interest to photovoltaic, sensing, and LED communities because of their unique ability to undergo anion and cation exchange; allowing for composition tunable energy harvesting, detection, and color, respectively. Dynamic binding of surface ligands to interfaces with desorption triggered by excess acid or base, however, leads to hindrance of properties. These features place perovskite NPs in an interesting niche; nanosystems that act as both catalysts and reactants in reactions. Utilizing the labile ligand-NP bonds, parent ligands can be exchanged with ligands of the same functionality (ammonium/carboxylate) to catalyze the reaction of the NPs with 2-bromododecenoic acid (2-Br) to produce either Finkelstein or elimination products. How the binding strength and proximity of 2-Br to the NP surface over the course of the reaction (probed with DOSY and ROSY respectively) establishes perovskite NP surfaces as catalysis sites will be discussed. Reaction mechanisms for the generation of finkelstein and elimination products concomitant to composition change from CsPbBr3-xIx to CsPbBr3 NP will be presented.

Monitoring catalysis of organohalide reactions with perovskite nanoparticle surfaces

256th National Meeting (2018)

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