Using 1H and 31P nuclear magnetic resonance spectroscopy, we have probed the steric and electronic factors that determine the binding affinities of ligands to CdSe surfaces. We have evaluated the binding affinities of neutral ligands relative to tri-n-butylphosphine and shown that the packing density is strongly impacted by the ligands steric bulk. I will also discuss the binding of anionic ligands that balance charge with outer sphere cations to stoichiometric nanocrystals. The tight binding of carboxylate, phosphonate, and carbamate anions makes the preparation and isolation of stoichiometric nanocrystals with neutral donor ligands especially challenging. Moreover, our studies have shown that the stabilization of colloidal dispersions by neutral ligands is poor, suggesting that nanocrystals are rarely stabilized by this coordination motif alone. <br/>

Affinity of neutral Lewis bases and ion pairs for colloidal nanocrystal surfaces

2019 Spring National Meeting

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