A readily accessible PNP pincer ligand with a pyrrole backbone and its NiI/II chemistry

Abstract

The novel chelating PNP pincer ligand 2,5-bis((diphenylphosphino)methyl)-1H-pyrrole (1) was prepared and its nickel coordination chemistry explored. The reaction with Ni(COD)₂ led to a diamagnetic dinuclear nickel(I) complex (4) which was also obtained by the reaction of the square planar Ni^II complexes [(PNP-Ph₂)NiX] (X = Cl (2), X = I (3)) with Li(Et₃BH).