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Quantifying the Thermodynamics of Ligand Binding to CsPbBr

Quantifying the Thermodynamics of Ligand Binding to CsPbBr

Sara R Smock, Travis J Williams, Richard L Brutchey

Angew Chem Int Ed Engl. 2018 Sep 3;57(36):11711-11715.

PMID: 30051545

Abstract:

Cesium lead halide perovskites are an emerging class of quantum dots (QDs) that have shown promise in a variety of applications; however, their properties are highly dependent on their surface chemistry. To this point, the thermodynamics of ligand binding remain unstudied. Herein, 1 H NMR methods were used to quantify the thermodynamics of ligand exchange on CsPbBr3 QDs. Both oleic acid and oleylamine native ligands dynamically interact with the CsPbBr3 QD surface, having individual surface densities of 1.2-1.7 nm-2 . 10-Undecenoic acid undergoes an exergonic exchange equilibrium with bound oleate (Keq =1.97) at 25 °C while 10-undecenylphosphonic acid undergoes irreversible ligand exchange. Undec-10-en-1-amine exergonically exchanges with oleylamine (Keq =2.52) at 25 °C. Exchange occurs with carboxylic acids, phosphonic acids, and amines on CsPbBr3 QDs without etching of the nanocrystal surface; increases in the steady-state PL intensities correlate with more strongly bound conjugate base ligands.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP867258922	10-Undecenylphosphonic acid		867258-92-2	Price

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