Date Published: May 01, 2010
Publisher: International Union of Crystallography
Author(s): Wojciech Starosta, Janusz Leciejewicz.
The polymeric structure of the title compound, [Pb(C5H3N2O2)2(H2O)]n, is built up from centrosymmetric [Pb(C5H3N2O2)2(H2O)]2 dimers, which are bridged by ligand carboxylate O atoms. The PbII ion adopts an irregular PbN2O5 coordination polyhedron; it is chelated by one N,O-bidentate ligand and also bonds to a water O atom. A second N,O-bidentate ligand forms the dimer bridge and another bridging O atom from a nearby dimer also bonds to the PbII ion, leading to layers propagating in (100). A network of O—H⋯O hydrogen bonds operates between water O atoms (donors) and carboxylate O atoms (acceptors).
For the crystal structures of divalent metal ions with pyrazine-2-carboxylate and water ligands, see, for example: Alcock et al. (1996 ▶); Ptasiewicz-Bąk et al. (1995 ▶, 1998 ▶). The structures of lead(II) complexes with pyrazine-4-carboxylate (Starosta & Leciejewicz, 2009 ▶) and pyrazine-3-carboxylate ligands (Starosta & Leciejewicz, 2010 ▶) have also been reported.