Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
I will describe the coordination chemistry of CdSe nanocrystals with an emphasis on our measurements of ligand binding affinity. Using NMR spectroscopy we have probed the steric and electronic factors that determine the binding affinities of neutral ligands and measured the affinities of those ligands relative to tri-n-butylphosphine. In addition, I will discuss the binding of anionic ligands that balance charge with outer sphere cations to stoichiometric nanocrystals and the importance of this motif to the synthesis and isolation of stoichiometric nanocrystals. In particular, we have found that carboxylate, phosphonate, and carbamate anions have high affinities for stoichiometric nanocrystals. 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. Using a displacement strategy described in a recent publication (JACS, 2017, (139), 3227 - 3226) we have been able to prepare CdSe nanocrystals with a pure amine ligand shell. Using these nanocrystals, we have prepared nanocrystal thin films with high field effect electron transport mobilities (> 10 cm^2/V/sec).
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