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Alonso, José Miguel and Muñoz, María Paz 
ORCID: https://orcid.org/0000-0001-9037-349X
(2018)
Evidence of hybrid homogeneous–heterogeneous catalysis in a Pt/Au heterobimetallic system.
ChemCatChem, 10 (12).
pp. 2646-2654.
ISSN 1867-3880
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Abstract
We report here our efforts towards understanding the catalytic species involved in a novel Pt/Au heterobimetallic system capable of efficiently catalyse the tandem cyclisation/C-X coupling reaction of heteroarylallenes with C- and N-based nucleophiles. Our evidence confirm that homogeneous Au-catalysis is involved at the beginning of the reaction to generate an intermediate that enters the second catalytic cycle where hybrid homogeneous-heterogeneous catalysis by [Pt-Au] clusters could be responsible for the high efficiency. In this part of the cycle [Pt-AuPPh3] homogeneous clusters (identified by 31P NMR) seem to be aided by Pt-Au particles in the heterogeneous phase (supported by Hg poisoning and filtration experiments, and characterization of the possible catalytic species by several techniques, e.g. 31P NMR, ICP-MS, SEM, DLS), with full Pt- to-Au transmetallation not being observed in contrast with other reported bimetallic systems. There are a few examples of hybrid homogeneous-heterogeneous catalysis in monometallic systems, but to the best of our knowledge this is the first example of hybrid homo- heterogeneous catalysis in systems involving two different metals.
| Item Type: | Article |
|---|---|
| Faculty \ School: | Faculty of Science > School of Chemistry |
| UEA Research Groups: | Faculty of Science > Research Groups > Chemistry of Materials and Catalysis |
| Depositing User: | Pure Connector |
| Date Deposited: | 28 Mar 2018 13:30 |
| Last Modified: | 22 Oct 2022 03:40 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/66635 |
| DOI: | 10.1002/cctc.201800076 |
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