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ABSTRACT: In the layered title coordination polymer, {[Ba2(C5H3N2O2)2(H2O)7](C5H3N2O2)2}n, the coordination geometries around the two independent BaII ions can be described as bicapped square-antiprismatic [BaNO9] arrangements. A two-dimensional polymeric framework with (6,3) topology can be observed in the ac plane, the nodes being provided by BaII ions and the connectors being N and O atoms belonging to pyrazine-2-carboxylate ligands and O atoms of bridging water molecules. Non-coordinating pyrazine-2-carboxylate ions are located between the polymeric layers in the crystal and are interconnected through extensive O—H...N,O hydrogen bonding.
Acta Crystallographica Section E. 01/2011;
