Chemistry - A European Journal
10.1002/chem.201803274
FULL PAPER
measurements were conducted at High Voltage Electron
Microscope Laboratory, Institute of Materials and Systems for
Sustainability,
Nagoya
University,
supported
by
"Nanotechnology Platform" of MEXT, Japan.
Keywords: bimetallic nanoparticles • N-heterocyclic carbenes •
nanozyme • hydrogenation • transfer hydrogenation
[
[
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GC with n-decane as internal standard. b 20 bar H
2
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Conclusions
In conclusion, AuPd alloy NPs of different metal compositions
have been successfully stabilized for the first time with NHC
ligands leading to monodisperse NPs with long-term stability.
Extensive characterization confirmed the alloy structure of the
NP core, the presence of the NHC ligand on the particle surface
and electronic interactions between the metal atoms and
immobilized ligands. The NHC functionalized AuPdNPs can be
easily immobilized on TiO as support in order to use them as
2
recyclable catalyst. The unsupported alloy NPs exhibited high
activity as catalysts in water for the oxidation of D-glucose. By far
the highest conversion was observed for NHC@Au95Pd
can be explained by their superior colloidal stability in
comparison with monometallic AuNPs. The alloy NPs on TiO
were successfully applied in the semi-hydrogenation of
diphenylacetylene with switchable selectivity towards (Z)- or (E)-
stilbene by slightly adjusting the reaction conditions. The
selectivity switch can be attributed to an AuPdNP catalyzed
5
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Acknowledgements
We are grateful for generous financial support by the Deutsche
Forschungsgemeinschaft (SFB 858) and JSPS Core-to-Core
Program “Elements Function for Transformative Catalysis and
Materials”. We thank Michael Holtkamp (Institute of Inorganic
and Analytical chemistry, WWU Münster) for TXRF analyses,
Jessica Hüsker (MEET, WWU Münster) for TGA measurements
and Dr. Melanie Brinkkötter (Institut für Physikalische Chemie,
WWU Münster) for solid-state-NMR experiments. STEM-EDS
1576–1579.
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