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Palladium clusters on Schiff base-functionalized UIO-66 MOFs as efficient catalysts for Suzuki coupling reactions Tebello Mahamo 1* , Mojalefa Hlapane 1 , Mduduzi Cele 2 1 Department of Chemistry and Chemical Technology, Faculty of Science and Technology, National University of Lesotho, P. O. Roma 180, Maseru, Lesotho. 2 School of Chemistry, Faculty of Natural and Agricultural Sciences, Northwest University, Mafikeng, Northwest, South Africa. t.mahamo@gmail.com Metal-organic frameworks (MOFs) are organic molecules linked by inorganic building units that form crystalline and highly porous materials in well-defined structures. Due to their unique structural and functional properties, this subset of compounds has emerged as an important family of porous materials. 1,2 This study presents the synthesis and characterization a series of UIO-66-NH2 Schiff base modified MOFs, and catalytic testing of their Pd loaded analogues as efficient catalysts for the Suzuki- Miyaura coupling reaction. The results show that low catalyst loadings are required for these catalysts while high yield and short reaction times are maintained. The UIO-66-DPB-Pd with a P,N-donor bidentate ligand produced higher biphenyl yields than analogous UIO-66-SA-Pd catalyst series with an N,O-donor ligands. A critical advantage of these catalysts is their excellent recyclability. The robust framework of UIO-66 allows for the facile recovery of palladium clusters without significant loss of catalytic performance; the selected catalysts were recovered for up to 8 cycles without any significant decrease in biphenyl production.
Key words: Pd-MOFs, Efficient Suzuki Catalysts, Recyclability References 1. X. F. Lu, Y. Fang, D. Luan and X. W. D. Lou, Nano Lett , 2021, 21, 1555. 2. Y. Liu, J. Sun, L. Fan and Q. Xu, Front Chem , 2022, 10, 845274 .
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