Poly[di-μ2-acetato-κ4O:O′-μ3-thiourea-κ3S:S:S-lead(II)]: a redetermination

Abstract

The structure of the title polymeric lead(II) thiourea complex, [Pb(CH3O)2{SC(NH2)2}]n, has been redetermined at significantly higher precision using diffractometer data at 100 K. The previous determination used data obtained from multiple-film integrated Weissenberg photographs [Nardelli et al. (1960). Acta Cryst. 13, 898–904]. The main difference between the two models is in the precision of the bond lengths, angles and cell parameters. In the crystal, the eight-coordinate PbII atom is chelated by two carboxylate groups and bridged by three S atoms from thiourea ligands. The coordination sphere is completed by an O atom from a third carboxylate group, the second O atom of which binds to a neighbouring PbII atom, forming a polymeric chain that runs the a axis. Two of these chains are related by centres of symmetry. Intermolecular hydrogen bonds connect neighbouring chains to one another, generating a three-dimensional network.

Keywords

• crystal structure
• low temperature
• polymeric lead thiourea salt