High catalytic activity in aqueous heck and Suzuki–Miyaura reactions catalyzed by novel Pd/Ln coordination polymers based on 2,2′-bipyridine-4,4′-dicarboxylic acid as a heteroleptic ligand

Abstract

Four novel heterobimetallic Pd/Ln coordination polymers, [LnPd(BPDC)5/2(H2O)·4H2O]n (Ln=Nd (1), Sm (2), Eu (3) and Dy (4); H2BPDC=2,2′-bipyridine-4,4′-dicarboxylic acid), have been synthesized under hydrothermal conditions and characterized by X-ray crystallography, thermogravimetric (TG) analysis, powder X-ray diffraction (PXRD) spectroscopy, elemental analysis and infrared spectroscopy (IR). Single-crystal X-ray diffraction analysis revealed that compounds 1–4 are isomorphous, having a 2D layer structure with a triclinic crystal system. The new Pd/Ln coordination polymers displayed impressively high activity in Heck and Suzuki–Miyaura cross-coupling reactions under eco-friendly, aqueous conditions.