Electronic and Vibrational Signatures of the Au(p-MBA) Cluster.
Optical absorption of a gold nanocluster of 102 Au atoms protected by 44 para-mercaptobenzoic acid (p-MBA) ligands is measured in the range of 0.05-6.2 eV (mid-IR to UV) by a combination of several techniques for purified samples in solid and solution phases. The results are compared to calculations...
| Publicado en: | Journal of the American Chemical Society Vol. 133; no. 11; pp. 3752 - 3756 |
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| Autores principales: | , , , , , , |
| Formato: | Artículo |
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American Chemical Society
3/23/2011
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=63149533&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 63149533 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 3/23/2011 vid: 133 iid: 11 pid: 997 pub: American Chemical Society artinfo: ui: 63149533 10.1021/ja111077e ppf: 3752 ppct: 4 formats: tig: atl: Electronic and Vibrational Signatures of the Au(p-MBA) Cluster. aug: au: Hulkko, Eero Lopez-Acevedo, Olga Koivisto, Jaakko Levi-Kalisman, Yael Kornberg, Roger D. Pettersson, Mika Häkkinen, Hannu affil: Nanoscience Center, Department of Chemistry, P.O. Box 35, FI-40014 University of Jyväskylä, Finland Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, United States Nanoscience Center, Department of Physics, P.O. Box 35, FI-40014 University of Jyväskylä, Finland su: Light absorption Vibrational circular dichroism Cluster analysis (Statistics) Density functionals Glutathione sug: subj: Light absorption Vibrational circular dichroism Cluster analysis (Statistics) Density functionals Glutathione ab: Optical absorption of a gold nanocluster of 102 Au atoms protected by 44 para-mercaptobenzoic acid (p-MBA) ligands is measured in the range of 0.05-6.2 eV (mid-IR to UV) by a combination of several techniques for purified samples in solid and solution phases. The results are compared to calculations for a model cluster Au(SMe) based on the time-dependent density functional theory in the linear-response regime and using the known structure of Au(p-MBA). The measured and calculated molar absorption coefficients in the NIR-vis region are comparable, within a factor of 2, in the absolute scale. Several characteristic features are observed in the absorption in the range of 1.5-3.5 eV. The onset of the electronic transitions in the mid-IR region is experimentally observed at 0.45 ± 0.05 eV which compares well with the lowest calculated transition at 0.55 eV. Vibrations in the ligand layer give rise to fingerprint IR features below the onset of low-energy metal-to-metal electronic transitions. Partial exchange of the p-MBA ligand to glutathione does not affect the onset of the electronic transitions, which indicates that the metal core of the cluster is not affected by the ligand exchange. The full spectroscopic characterization of the Au(p-MBA) reported here for the first time gives benchmarks for further studies of manipulation and functionalization of this nanocluster to various applications. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2011 holdings: @attributes: islocal: N |
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