Abstract
A Pd/Y heterobimetallic MOF (denoted as Pd/Y-MOF) catalyst is synthesized by coordination of Pd(II) and Y(III) with 2,2′-bipyridine-5,5′-dicarboxylate acid (bpydc) under microwave irradiation condition and is characterized by XRD Rietveld refinement, FTIR, Raman, TG-DTA, and XPS. It is shown that the 3D extended framework is constructed by linking Pd(bpydc)Cl2 building blocks via Y(III) coordinating to carboxylic groups. Pd/Y-MOF exhibits higher catalytic activity than Pd(bpydc)Cl2 in Suzuki-Miyaura coupling reaction and Sonogashira reaction owing to the highly dispersed Pd(II) sites in the layered structure of Pd/Y-MOF and the cooperative effect between Pd(II) and Y(III). The heterogeneity studies provide mechanistic evidence that the reaction proceeds on the surface of Pd(II) ions in the crystal framework. Thus, Pd/Y-MOF exhibits impressive size selectivity toward substrates. With the small-sized reactants, it displays comparable activities with Pd(OAc)2 homogeneous catalyst. However, extremely poor act...
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