Intermolecular Pb...N interactions in lead(II) dimers producing a supramolecular two-dimensional metal–organic compound: bis[μ2-N′-(2-oxidobenzylidene)benzohydrazidato-κ4O:O,N′,O′]dilead(II)

Abstract

Aroylhydrazones ofortho-hydroxy aldehydes are Schiff base ligands that typically coordinate as a chelate in anO,N,O′-manner. Dinuclear complexes are normally observed, with the phenolate O atom acting as the bridging atom. The switchable protonation state of the tridentateN′-(2-hydroxybenzylidene)benzohydrazide (H2sabhz) ligand can lead to variations in the resulting supramolecular structure. The title compound, [Pb2(C14H10N2O2)2], was prepared by the reaction of [Pb(OAc)2]·3H2O (OAc is acetate) with the benzoylhydrazone derivative of salicylaldehyde,i.e.H2sabhz, in the presence of triethylamine in methanol. In the crystal structure, each PbIIatom of the dimer has an NO3coordination environment, with one sabhz ligand coordinating in anO,N,O′-manner and with the second sabhz ligand coordinatingviathe bridging phenolate O atom, since the dimers are located on a centre of inversion. It has been found that the dimers are connected by Pb...N interactions, resulting in a two-dimensional supramolecular network which shows the [32.52,3.53] net topology. Thes2electron pair of the PbIIion clearly influences the observed intermolecular interactions.