Binding of Phosphonic Acids to CdSe Quantum Dots: A Solution NMR Study

被引：242

作者：

Gomes, Raquel ^{[1
]}

Hassinen, Antti

Szczygiel, Agnieszka ^{[1
]}

Zhao, Qiang ^{[2
,3
]}

Vantomme, Andre ^{[2
,3
]}

Martins, Jose C. ^{[1
]}

Hens, Zeger

机构：

[1] Univ Ghent, NMR & Struct Anal, B-9000 Ghent, Belgium

[2] Katholieke Univ Leuven, Inst voor Kern en Stralingsfys, B-3001 Louvain, Belgium

[3] Katholieke Univ Leuven, INPAC, B-3001 Louvain, Belgium

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2011年 / 2卷 / 03期

关键词：

MAGNETIC-RESONANCE-SPECTROSCOPY; FIELD GRADIENT NMR; TRIOCTYLPHOSPHINE OXIDE; COLLOIDAL NANOCRYSTALS; LIGAND-EXCHANGE; NANOPARTICLES; GROWTH; SURFACE; DIFFUSION; NANORODS;

D O I：

10.1021/jz1016729

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We use H-1 and P-31 solution nuclear magnetic resonance spectroscopy to analyze the binding of phosphonic acid ligands to wurtzite CdSe quantum dots (CdSe QDs). CdSe QDs synthesized with phosphonic acids as a surfactant have a ligand shell composed of phosphonic acid and phosphonic acid anhydride moieties. Titrations of as-synthesized QDs with excess oleic acid do not induce desorption of phosphonic species, whereas titration of oleic acid exchanged QDs with excess phosphonic acid shows that the latter quantitatively replaces the oleic acid with a 1:1 stoichiometry. Both the stoichiometry of the oleic acid/phosphonic acid exchange interaction and the ratio between the Cd surface excess and the ligand density indicate that phosphonic acids bind as hydrogen phosphonates to the CdSe surface.

引用

页码：145 / 152

页数：8

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