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dc.contributor.author
Venkatesh, Amrit
dc.contributor.author
Lund, Alicia
dc.contributor.author
Rochlitz, Lukas
dc.contributor.author
Jabbour, Ribal
dc.contributor.author
Gordon, Christopher
dc.contributor.author
Menzildjian, Georges
dc.contributor.author
Viger-Gravel, Jasmine
dc.contributor.author
Berruyer, Pierrick
dc.contributor.author
Gajan, David
dc.contributor.author
Copéret, Christophe
dc.contributor.author
Lesage, Anne
dc.contributor.author
Rossini, Aaron J.
dc.date.accessioned
2020-11-20T15:16:08Z
dc.date.available
2020-11-13T18:55:49Z
dc.date.available
2020-11-20T15:16:08Z
dc.date.issued
2020-11-04
dc.identifier.issn
0002-7863
dc.identifier.issn
1520-5126
dc.identifier.other
10.1021/jacs.0c09101
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/451351
dc.description.abstract
The molecular level characterization of heterogeneous catalysts is challenging due to the low concentration of surface sites and the lack of techniques that can selectively probe the surface of a heterogeneous material. Here, we report the joint application of room temperature proton-detected NMR spectroscopy under fast magic angle spinning (MAS) and dynamic nuclear polarization surface enhanced NMR spectroscopy (DNP-SENS), to obtain the 195Pt solid-state NMR spectra of a prototypical example of highly dispersed Pt sites (single site or single atom), here prepared via surface organometallic chemistry, by grafting [(COD)Pt(OSi(OtBu)3)2] (1, COD = 1,5-cyclooctadiene) on partially dehydroxylated silica (1@SiO2). Compound 1@SiO2 has a Pt loading of 3.7 wt %, a surface area of 200 m2/g, and a surface Pt density of around 0.6 Pt site/nm2. Fast MAS 1H{195Pt} dipolar-HMQC and S-REDOR experiments were implemented on both the molecular precursor 1 and on the surface complex 1@SiO2, providing access to 195Pt isotropic shifts and Pt–H distances, respectively. For 1@SiO2, the measu red isotropic shift and width of the shift distribution constrain fits of the static wide-line DNP-enhanced 195Pt spectrum, allowing the 195Pt chemical shift tensor parameters to be determined. Overall the NMR data provide evidence for a well-defined, single-site structure of the isolated Pt sites. © 2020 American Chemical Society.
en_US
dc.language.iso
en
en_US
dc.publisher
American Chemical Society
en_US
dc.title
The Structure of Molecular and Surface Platinum Sites Determined by DNP-SENS and Fast MAS 195Pt Solid-State NMR Spectroscopy
en_US
dc.type
Journal Article
dc.date.published
2020-10-22
ethz.journal.title
Journal of the American Chemical Society
ethz.journal.volume
142
en_US
ethz.journal.issue
44
en_US
ethz.journal.abbreviated
J. Am. Chem. Soc.
ethz.pages.start
18936
en_US
ethz.pages.end
18945
en_US
ethz.grant
Molecular Approach to Heterogeneous Catalysis
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02020 - Dep. Chemie und Angewandte Biowiss. / Dep. of Chemistry and Applied Biosc.::02513 - Laboratorium für Anorganische Chemie / Laboratory of Inorganic Chemistry::03872 - Copéret, Christophe / Copéret, Christophe
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02020 - Dep. Chemie und Angewandte Biowiss. / Dep. of Chemistry and Applied Biosc.::02513 - Laboratorium für Anorganische Chemie / Laboratory of Inorganic Chemistry::03872 - Copéret, Christophe / Copéret, Christophe
ethz.grant.agreementno
169134
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Projektförderung in Mathematik, Natur- und Ingenieurwissenschaften (Abteilung II)
ethz.date.deposited
2020-11-13T18:56:09Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2020-11-20T15:16:20Z
ethz.rosetta.lastUpdated
2021-02-15T20:52:25Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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