The Origin of Shape Sensitivity in Palladium-Catalyzed Suzuki-Miyaura Cross Coupling Reactions

The shape sensitivity of Pd catalysts in Suzuki–Miyaura coupling reactions is studied using nanocrystals enclosed by well‐defined surface facets. The catalytic performance of Pd nanocrystals with cubic, cuboctahedral and octahedral morphologies are compared. Superior catalytic reactivity is observed...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2014-04, Vol.53 (16), p.4142-4145
Main Authors: Collins, Gillian, Schmidt, Michael, O'Dwyer, Colm, Holmes, Justin D., McGlacken, Gerard P.
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
heterogeneous catalysis
Joining
Leaching
Models, Molecular
Molecular Structure
Morphology
Nanocrystals
Origins
Palladium
Palladium - chemistry
surface facet
Suzuki-Miyaura coupling
Tracking
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Summary:The shape sensitivity of Pd catalysts in Suzuki–Miyaura coupling reactions is studied using nanocrystals enclosed by well‐defined surface facets. The catalytic performance of Pd nanocrystals with cubic, cuboctahedral and octahedral morphologies are compared. Superior catalytic reactivity is observed for Pd NCs with {100} surface facets compared to {111} facets. The origin of the enhanced reactivity associated with a cubic morphology is related to the leaching susceptibility of the nanocrystals. Molecular oxygen plays a key role in facilitating the leaching of Pd atoms from the surface of the nanocrystals. The interaction of O2 with Pd is itself facet‐dependent, which in turn gives rise to more efficient leaching from {100} facets, compared to {111} facets under the reaction conditions. Tracking catalysis: The shape sensitivity of cubic, cuboctahedral, and octahedral Pd nanoparticle catalysts in Suzuki–Miyaura coupling reactions was studied. Superior catalytic reactivity is observed for Pd NCs with {100} surface facets compared to {111} facets. The origin of the enhanced reactivity associated with a cubic morphology is related to the leaching susceptibility of the nanocrystals.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201400483