NHC-copper complexes immobilized on magnetic nanoparticles: Synthesis and catalytic activity in the CuAAC reactions
[Display omitted] •Direct synthesis of NHC-copper complexes on magnetic nanoparticles.•Stable NHC-Cu(II) complexes easily prepared from Cu(II) salt anchored on iron oxide nanoparticles.•Magnetically-separable NHC-Cu(II) complexes as catalysts active in CuAAC reactions.•NHC-Cu(II) complexes anchored...
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Published in | Journal of catalysis Vol. 362; pp. 46 - 54 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Inc
01.06.2018
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Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
•Direct synthesis of NHC-copper complexes on magnetic nanoparticles.•Stable NHC-Cu(II) complexes easily prepared from Cu(II) salt anchored on iron oxide nanoparticles.•Magnetically-separable NHC-Cu(II) complexes as catalysts active in CuAAC reactions.•NHC-Cu(II) complexes anchored on solid phase active even without usage of reducing agent.
A series of N-heterocyclic carbene copper(I) and rare copper(II) complexes (NHCCuCl or NHCCuCl2) were covalently immobilized directly on the surface of magnetic nanoparticles (MNPs) for the first time. The physicochemical properties were investigated by a broad range of techniques, including SEM and TEM microscopy, and TG analysis. The supported complexes exhibited excellent activity in the Huisgen cycloaddition with in situ generated azides. Unexpectedly, a direct comparison of NHCCuCl and NHCCuCl2 complexes anchored to the magnetic nanoparticles confirmed the higher activity of the latter for the formation of 1,2,3-triazoles, also under ascorbate-free conditions. |
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ISSN: | 0021-9517 1090-2694 |
DOI: | 10.1016/j.jcat.2018.03.015 |