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

摘要

Four novel heterobimetallic Pd/Ln coordination polymers, [LnPd(BPDC)(5/2)(H2O).4H(2)O](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. (C) 2016 Elsevier Ltd. All rights reserved.