Reversible binding of an inorganic cluster-anion to the surface of a gold nanoparticle

Yifeng Wang; Offer Zeiri; Vitaly Gitis; Alevtina Neyman; Ira A. Weinstock

doi:10.1016/j.ica.2010.06.040

Reversible binding of an inorganic cluster-anion to the surface of a gold nanoparticle

Yifeng Wang, Offer Zeiri, Vitaly Gitis, Alevtina Neyman, Ira A. Weinstock

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Reversible dissociation of POM ligands from electrostatically stabilized monolayer assemblies on metal(0)-nanoparticle surfaces would provide substrates with direct access to reactive metal(0) lattices. As a result, POM-ligand lability could play an important role in catalysis by POM-monolayer protected metal(0) nanoparticles. POM-ligand lability was addressed by first obtained cryogenic transmission electron microscopy (cryo-TEM) images of monolayers of α-AlW11O399- on a 5.4 nm diameter gold-core nanoparticle. These are the smallest nanoparticles on which POM monolayers have been imaged by cryo-TEM. The binding affinities of α-K9AlW11O39 (K₉1) and α-Na5AlW12O40 (Na₅2) were obtained from Langmuir isotherms, and the relative labilities of the two ligands were assessed by UV-Vis analysis of changes in surface plasmon resonance (SPR) upon incremental additions of citrate. Thermodynamic constants, K, for monolayer formation by 1 and 2 are 20,000 and 150 M^-1, respectively. In timed reactions with citrate, 1 exhibits a substantial kinetic barrier to dissociation, while 2 is rapidly exchanged by the organic protecting ligand.

Original language	English
Pages (from-to)	4416-4420
Number of pages	5
Journal	Inorganica Chimica Acta
Volume	363
Issue number	15
DOIs	https://doi.org/10.1016/j.ica.2010.06.040
State	Published - 10 Dec 2010

Keywords

Gold nanoparticle
Monolayer
Polyoxometalate
Self-assembly

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/j.ica.2010.06.040

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abstract = "Reversible dissociation of POM ligands from electrostatically stabilized monolayer assemblies on metal(0)-nanoparticle surfaces would provide substrates with direct access to reactive metal(0) lattices. As a result, POM-ligand lability could play an important role in catalysis by POM-monolayer protected metal(0) nanoparticles. POM-ligand lability was addressed by first obtained cryogenic transmission electron microscopy (cryo-TEM) images of monolayers of α-AlW11O399- on a 5.4 nm diameter gold-core nanoparticle. These are the smallest nanoparticles on which POM monolayers have been imaged by cryo-TEM. The binding affinities of α-K9AlW11O39 (K91) and α-Na5AlW12O40 (Na52) were obtained from Langmuir isotherms, and the relative labilities of the two ligands were assessed by UV-Vis analysis of changes in surface plasmon resonance (SPR) upon incremental additions of citrate. Thermodynamic constants, K, for monolayer formation by 1 and 2 are 20,000 and 150 M-1, respectively. In timed reactions with citrate, 1 exhibits a substantial kinetic barrier to dissociation, while 2 is rapidly exchanged by the organic protecting ligand.",

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AU - Zeiri, Offer

AU - Gitis, Vitaly

AU - Neyman, Alevtina

AU - Weinstock, Ira A.

PY - 2010/12/10

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Reversible binding of an inorganic cluster-anion to the surface of a gold nanoparticle

Abstract

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