A new lead(II) complex of 2,2′-bipyridine, acetate and thiocyanate ligands: synthesis, characterization and crystal structure of [Pb(bpy)(NCS)(CH3COO)] n

Abstract

A new lead(II) complex of 2,2′-bipyridine (bpy), acetate and thiocyanate has been synthesized and characterized by C H N elemental analysis, IR, 1H NMR, 13C NMR and 207Pb NMR spectroscopy. The structure of [Pb(bpy)(NCS)(CH3COO)] n was confirmed by X-ray crystallography. Single-crystal X-ray data show the complex to be a one-dimensional polymer as a result of thiocyanate ligand bridging with the basic repeating monomeric units [Pb(bpy)(NCS)(CH3COO)]. The Pb atom has an unsymmetrical five-coordinate geometry, being coordinated by two nitrogen atoms of bpy, two oxygen atoms of the acetate and one nitrogen atom of the thiocyanate anion. The arrangement of the bpy, acetate and nitrate ligands exhibits a coordination gap around the Pb(II) ion, occupied possibly by a stereoactive lone pair of electrons on lead(II), and the coordination around the lead atoms is hemidirected. There are π–π stacking interactions between the parallel aromatic rings.