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PMO‐Immobilized Au I –NHC Complexes: Heterogeneous Catalysts for Sustainable Processes
Author(s) -
De Canck Els,
Nahra Fady,
Bevernaege Kevin,
Vanden Broeck Sofie,
Ouwehand Judith,
Maes Diederick,
Nolan Steven P.,
Van Der Voort Pascal
Publication year - 2018
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201701102
Subject(s) - catalysis , synthon , nanoporous , chemistry , mesoporous material , carbene , sulfonic acid , heterogeneous catalysis , combinatorial chemistry , chemical engineering , organic chemistry , engineering
Abstract A stable periodic mesoporous organosilica (PMO) with accessible sulfonic acid functionalities is prepared via a one‐pot‐synthesis and is used as solid support for highly active catalysts, consisting of gold(I)‐ N ‐heterocyclic carbene (NHC) complexes. The gold complexes are successfully immobilized on the nanoporous hybrid material via a straightforward acid–base reaction with the corresponding [Au(OH)(NHC)] synthon. This catalyst design strategy results in a boomerang‐type catalyst, allowing the active species to detach from the surface to perform the catalysis and then to recombine with the solid after all the starting material is consumed. This boomerang behavior is assessed in the hydration of alkynes. The tested catalysts were found to be active in the latter reaction, and after an acidic work‐up, the IPr*‐based gold catalyst can be recovered and then reused several times without any loss in efficiency.