Journal
MATERIALS
Volume 10, Issue 2, Pages -Publisher
MDPI AG
DOI: 10.3390/ma10020099
Keywords
metal-organic frameworks; MIL-101; post-synthesis modification; three-component coupling reactions; propargylamines
Categories
Funding
- Promotive Research Fund for Young and Middle-aged Scientists of Shandong Province [BS2014CL021]
- Project of Shandong Province Higher Educational Science and Technology Program [J14LC01]
- Technology Research and Development Program of Weifang [2014GX030]
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Post-synthesis modification is a useful method for the functionalization of metal-organic frameworks (MOFs). A novel catalyst Au@MIL-101-ED-SA (ED = ethylenediamine, SA = salicylaldehyde), containing coexisting Au3+ ions and Au-0 nanoparticles, was prepared successfully by post-synthesis modification with ethylenediamine, salicylaldehyde and gold. Gold nanoparticles supported on MIL-101 (Au@MIL-101) were prepared successfully by the impregnation method. Au@MIL-101-ED-SA and Au@MIL-101 were characterized by N-2 adsorption-desorption, X-ray diffraction, infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, and inductively coupled plasma-optical emission spectrometry. Au@MIL-101-ED-SA and Au@MIL-101 were applied as environmentally friendly catalysts in the three-component coupling reaction of aldehydes, amines, and alkynes for the preparation of diverse propargylamines. Au@MIL-101-ED-SA contained a fraction of cationic gold (Au3+/Au-0 = 0.9) and showed higher catalytic activity than Au@MIL-101, which was prepared by the impregnation method. Furthermore, the reactions were performed under heterogeneous conditions and the novel catalyst was successfully recycled for four consecutive runs.
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