期刊
CHEMISTRY OF MATERIALS
卷 30, 期 15, 页码 5485-5492出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b02523
关键词
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资金
- FWO Vlaanderen
- IWT Vlaanderen
- Belgian American Education Foundation (B.A.E.F.)
- Fulbright
- Ghent University
- ETH Zurich
- COMPASS project [H2020-MSCA-RISE-2015-691185]
Although solvent-ligand interactions play a major role in nanocrystal synthesis, dispersion formulation, and assembly, there is currently no direct method to study this. Here we examine the broadening of H-1 NMR resonances associated with bound ligands and turn this poorly understood descriptor into a tool to assess solvent-ligand interactions. We show that the line broadening has both a homogeneous and a heterogeneous component. The former is nanocrystal-size dependent, and the latter results from solvent-ligand interactions. Our model is supported by experimental and theoretical evidence that correlates broad NMR lines with poor ligand solvation. This correlation is found across a wide range of solvents, extending from water to hexane, for both hydrophobic and hydrophilic ligand types, and for a multitude of oxide, sulfide, and selenide nanocrystals. Our findings thus put forward NMR line-shape analysis as an indispensable tool to form, investigate, and manipulate nanocolloids.
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