title: Intermolecular Pb...N interactions in lead(II) dimers producing a supramolecular two-dimensional metal-organic compound: bis[μ2-N'-(2-oxidobenzylidene)benzohydrazidato-κ(4)O:O,N',O']dilead(II).
abstract: Aroylhydrazones of ortho-hydroxy aldehydes are Schiff base ligands that typically coordinate as a chelate in an O,N,O'-manner. Dinuclear complexes are normally observed, with the phenolate O atom acting as the bridging atom. The switchable protonation state of the tridentate N'-(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 Pb(II) atom of the dimer has an NO3 coordination environment, with one sabhz ligand coordinating in an O,N,O'-manner and with the second sabhz ligand coordinating via the 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 [3(2).5(2),3.5(3)] net topology. The s(2) electron pair of the Pb(II) ion clearly influences the observed intermolecular interactions.
authors.affiliation: Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados/Itahum, km 12, Dourados, Mato Grosso do Sul 79804-970, Brazil.
authors.forename: Vânia Denise
authors.initials: VD
authors.lastname: Schwade
authors.affiliation: Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, Rodovia Dourados/Itahum, km 12, Dourados, Mato Grosso do Sul 79804-970, Brazil.
authors.forename: Eliandro
authors.initials: E
authors.lastname: Faoro
authors.affiliation: Departamento de Química, Universidade Federal de Santa Maria, Avenida Roraima, n. 1000, Santa Maria, Rio Grande do Sul 97105-900, Brazil.
authors.forename: Ernesto
authors.initials: E
authors.lastname: Schulz Lang
keywords: crystal structure; dinuclear; intermolecular Pb...N interactions; lead hydrazonate; lead(II) dimer; net topology; supramolecular two-dimensional arrangement