Ligand Migration from Cluster to Support: A Crucial Factor for Catalysis by Thiolate-protected Gold Clusters
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In: ChemCatChem, Vol. 10.2018, No. 23, 07.12.2018, p. 5372-5376.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Ligand Migration from Cluster to Support
T2 - A Crucial Factor for Catalysis by Thiolate-protected Gold Clusters
AU - Zhang, Bei
AU - Sels, Annelies
AU - Salassa, Giovanni
AU - Pollitt, Stephan
AU - Truttmann, Vera
AU - Rameshan, Christoph
AU - Llorca, Jordi
AU - Olszewski, Wojciech
AU - Rupprechter, Günther
AU - Bürgi, Thomas
AU - Barrabés, Noelia
N1 - Publisher Copyright: © 2018 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
PY - 2018/12/7
Y1 - 2018/12/7
N2 - Thiolate protected metal clusters are valuable precursors for the design of tailored nanosized catalysts. Their performance can be tuned precisely at atomic level, e. g. by the configuration/type of ligands or by partial/complete removal of the ligand shell through controlled pre-treatment steps. However, the interaction between the ligand shell and the oxide support, as well as ligand removal by oxidative pre-treatment, are still poorly understood. Typically, it was assumed that the thiolate ligands are simply converted into SO2, CO2 and H2O. Herein, we report the first detailed observation of sulfur ligand migration from Au to the oxide support upon deposition and oxidative pre-treatment, employing mainly S K-edge XANES. Consequently, thiolate ligand migration not only produces clean Au cluster surfaces but also the surrounding oxide support is modified by sulfur-containing species, with pronounced effects on catalytic properties.
AB - Thiolate protected metal clusters are valuable precursors for the design of tailored nanosized catalysts. Their performance can be tuned precisely at atomic level, e. g. by the configuration/type of ligands or by partial/complete removal of the ligand shell through controlled pre-treatment steps. However, the interaction between the ligand shell and the oxide support, as well as ligand removal by oxidative pre-treatment, are still poorly understood. Typically, it was assumed that the thiolate ligands are simply converted into SO2, CO2 and H2O. Herein, we report the first detailed observation of sulfur ligand migration from Au to the oxide support upon deposition and oxidative pre-treatment, employing mainly S K-edge XANES. Consequently, thiolate ligand migration not only produces clean Au cluster surfaces but also the surrounding oxide support is modified by sulfur-containing species, with pronounced effects on catalytic properties.
KW - gold
KW - heterogeneous catalysis
KW - ligand effect
KW - nanocluster
KW - X-ray Absorption
UR - http://www.scopus.com/inward/record.url?scp=85057144012&partnerID=8YFLogxK
U2 - 10.1002/cctc.201801474
DO - 10.1002/cctc.201801474
M3 - Article
AN - SCOPUS:85057144012
VL - 10.2018
SP - 5372
EP - 5376
JO - ChemCatChem
JF - ChemCatChem
SN - 1867-3880
IS - 23
ER -
