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

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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 languageEnglish
Pages (from-to)4416-4420
Number of pages5
JournalInorganica Chimica Acta
Issue number15
StatePublished - 10 Dec 2010


  • Gold nanoparticle
  • Monolayer
  • Polyoxometalate
  • Self-assembly

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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