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  NMR characterization of ligand binding and exchange dynamics in triphenylphosphine-capped gold nanoparticles

Sharma, R., Holland, G. P., Solomon, V. C., Zimmermann, H., Schiffenhaus, S., Amin, S. A., et al. (2009). NMR characterization of ligand binding and exchange dynamics in triphenylphosphine-capped gold nanoparticles. The Journal of Physical Chemistry C, 113(37), 16387-16393. doi:10.1021/jp905141h.

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Alternativer Titel : NMR characterization of ligand binding and exchange dynamics in triphenylphosphine-capped gold nanoparticles

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JPhysChemC _113_2009_16387.pdf (beliebiger Volltext), 701KB
 
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http://pubs.acs.org/doi/pdfplus/10.1021/jp905141h (beliebiger Volltext)
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 Urheber:
Sharma, Ramesh, Autor
Holland, Gregory P., Autor
Solomon, Virgil C., Autor
Zimmermann, Herbert1, 2, Autor           
Schiffenhaus, Steven, Autor
Amin, Samrat A., Autor
Buttry, Daniel A., Autor
Yarger, Jeffery L., Autor
Affiliations:
1Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society, ou_1497705              
2Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society, ou_1497700              

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 Zusammenfassung: Triphenylphosphine (PPh3)-capped 1.8 nm diameter gold nanoparticles (AuNPs) are characterized by a combination of 1H, 2H, and 31P solution- and solid-state NMR. The 31P{1H} NMR resonance associated with the surface-bound PPh3 is clearly identified and is present as a broad peak centered at 56 ppm. 31P and 1H hole burning NMR experiments show that the line broadening associated with the surface-bound PPh3 is primarily due to a variety of different chemical shift environments at the surface of the nanoparticles. The surface bound PPh3 can be displaced with either d15-PPh3 or Au(d15-PPh3)Cl in CD2Cl2 solution. In both cases, exchange results in loss of Au(PPh3)Cl from the nanoparticle surface, with no evidence for loss of the PPh3 ligand alone. Solution-state NMR was used to determine the room temperature rate constants for these exchange processes, with values of 0.17 and 0.20 min-1, respectively. Thus, essentially the same rate is observed for displacement of Au(PPh3)Cl from the surface with either d15-PPh3 or Au(d15-PPh3)Cl. The observed 31P chemical shift of surface-bound PPh3 is consistent with mixed valence Au(0) and Au(I) at the nanoparticle surfaces, suggesting the presence of surface-bound Au complexes.

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Sprache(n): eng - English
 Datum: 2009-09-192009-06-012009-07-192009-08-252009-09-17
 Publikationsstatus: Erschienen
 Seiten: 7
 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
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Titel: The Journal of Physical Chemistry C
  Andere : J. Phys. Chem. C
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Washington DC : American Chemical Society
Seiten: - Band / Heft: 113 (37) Artikelnummer: - Start- / Endseite: 16387 - 16393 Identifikator: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766