Research Article: Poly[aqua­(μ-pyrazine-2-carboxyl­ato-κ3N,O:O)(μ-pyrazine-2-carboxyl­ato-κ3N,O:O′)lead(II)]

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).

Partial Text

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.




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