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Incorporation of CuO NPs into the modified UiO-66-NH2 metal-organic frameworks (MOFs) with melamine for catalytic C−O coupling in the Ullmann condensation

Abstract

The UiO-66-NH2 metal-organic framework (MOF) was initially modified with melamine via a post-synthesis approach. CuO nanoparticles (NPs) were then anchored by available functional groups (amine groups and π–electron interactions of melamine and ligand) on the surface of the modified MOF. The as-synthesized UiO-66-NH2-Mlm/CuO NPs were characterized by different techniques, i.e. XRD, TGA, TEM, EDX, and XPS. The CuO-supported MOF was successfully used as a heterogeneous catalyst for C−O coupling in the Ullmann condensation. A catalytic amount of the supported catalyst (5% CuO) promoted the condensation reaction for various aryl chlorides, bromides, and iodides under mild reaction conditions (100 ºC with KOH serving as a base) in good yield (30–95%) within 18–24 h. Even in the absence of KOH, the reaction was enabled with 55% yield in 24 h through grafting of the melamine with amine groups to create a base active site on the MOF. It indicates an additional task for the support as a base active site. The supported catalyst was easily recycled and reused several times with negligible loss in its activity. The copper leaching from the catalyst was as low as 1.2 wt% after four-times reusability.

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Publication details

The article was received on 13 Jun 2017, accepted on 06 Sep 2017 and first published on 06 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ02114C
Citation: New J. Chem., 2017, Accepted Manuscript
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    Incorporation of CuO NPs into the modified UiO-66-NH2 metal-organic frameworks (MOFs) with melamine for catalytic C−O coupling in the Ullmann condensation

    S. Sadeghi, M. Jafarzadeh, A. R. Abbasi and K. Daasbjerg, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02114C

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