Redetermination of (D-penicillaminato)- lead(II)

R factor = 0.032; wR factor = 0.085; data-to-parameter ratio = 23.2. In the title coordination polymer, [Pb(C5H9NO2S)]n {systematic name: catena-poly[(-2-amino-3-methyl-3-sulfido-butanoato)lead(II)]}, the d-penicillaminate ligand coordinates to the metal ion in an N,S,O-tridentate mode. The S atom acts as a bridge to two neighbouring PbII ions, thereby forming a double thiolate chain. Moreover, the coordinating carboxylate O atom forms bridges to the PbII ions in the adjacent chain. The overall coordination sphere of the PbII ion can be described as a highly distorted pentagonal bipyramid with a void in the equatorial plane between the long Pb—S bonds probably occupied by the stereochemically active inert electron pair. The amino H atoms form N—H S and N— H O hydrogen bonds, resulting in a cluster of four complex units, giving rise to an R4 4(16) ring lying in the ab plane. The crystal structure of the title compound has been reported previously [Freeman et al. (1974). Chem. Soc. Chem. Commun. pp. 366–367] but the atomic coordinates have not been deposited in the Cambridge Structural Database (refcode DPENPB). Additional details of the hydrogen bonding are presented here. Related literature For an earlier characterization of the title compound, see: Freeman et al. (1974). For neurotoxic effects of Pb, see: Needleman (2004); Bressler et al. (1999); Godwin (2001). For treatments of lead(II) poisoning, see: Sinicropi et al. (2010); Casas & Sordo (2006). For graph-set notation, see: Bernstein et al. (1994)