Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
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TY - JOUR
T1 - Incorporation of CuO NPs into modified UiO-66-NH2 metal-organic frameworks (MOFs) with melamine for catalytic C-O coupling in the Ullmann condensation
AU - Sadeghi, Samira
AU - Jafarzadeh, Mohammad
AU - Abbasi, Amir Reza
AU - Daasbjerg, Kim
PY - 2017/10/21
Y1 - 2017/10/21
N2 - Herein, the UiO-66-NH2 metal-organic framework (MOF) is initially modified with melamine via a post-synthetic approach. CuO nanoparticles (NPs) are then anchored via the available functional groups (amine groups and pi-electron interactions of melamine and ligand) on the surface of the modified MOF. The as-synthesized UiO-66-NH2-Mlm/CuO NPs are characterized using different techniques including XRD, TGA, TEM, EDX, and XPS. The CuO-supported MOF is successfully used as a heterogeneous catalyst for C-O coupling in Ullmann condensation. A catalytic amount of the supported catalyst (5% CuO) promotes the condensation reaction for various aryl chlorides, bromides, and iodides under mild reaction conditions (100 degrees C with KOH serving as a base) in good yield (30-95%) within 18-24 h. Even in the absence of KOH, the reaction is enabled with 55% yield in 24 h by grafting melamine with amine groups to create base active sites on the MOF, which indicates the additional role of the support as a base active site. The supported catalyst is easily recycled and reused several times with negligible loss in its activity. Furthermore, the copper leaching from the catalyst is as low as 1.2 wt% after being reused four times.
AB - Herein, the UiO-66-NH2 metal-organic framework (MOF) is initially modified with melamine via a post-synthetic approach. CuO nanoparticles (NPs) are then anchored via the available functional groups (amine groups and pi-electron interactions of melamine and ligand) on the surface of the modified MOF. The as-synthesized UiO-66-NH2-Mlm/CuO NPs are characterized using different techniques including XRD, TGA, TEM, EDX, and XPS. The CuO-supported MOF is successfully used as a heterogeneous catalyst for C-O coupling in Ullmann condensation. A catalytic amount of the supported catalyst (5% CuO) promotes the condensation reaction for various aryl chlorides, bromides, and iodides under mild reaction conditions (100 degrees C with KOH serving as a base) in good yield (30-95%) within 18-24 h. Even in the absence of KOH, the reaction is enabled with 55% yield in 24 h by grafting melamine with amine groups to create base active sites on the MOF, which indicates the additional role of the support as a base active site. The supported catalyst is easily recycled and reused several times with negligible loss in its activity. Furthermore, the copper leaching from the catalyst is as low as 1.2 wt% after being reused four times.
KW - EFFICIENT HETEROGENEOUS CATALYST
KW - REUSABLE CATALYST
KW - CU2O NANOPARTICLES
KW - FACILE SYNTHESIS
KW - COPPER CATALYST
KW - BOND FORMATION
KW - ARYL HALIDES
KW - ALCOHOLS
KW - DERIVATIVES
KW - OXIDATION
U2 - 10.1039/c7nj02114c
DO - 10.1039/c7nj02114c
M3 - Journal article
VL - 41
SP - 12014
EP - 12027
JO - New Journal of Chemistry
JF - New Journal of Chemistry
SN - 1144-0546
IS - 20
ER -