Poly[piperazinediium [[aqua-bismuth-ate(III)]-di-μ-pyridine-2,6- dicarboxylato-bismuthate(III)-di-μ-pyridine-2,6-dicarboxylato] monohydrate]

Abstract

The title compound, {(C4H12N2)[Bi2(C7H3NO4)4(H2O)]·H2O} n or {(pipzH2)[Bi2(pydc)4(H2O)]·H2O} n , where pydcH2 is pyridine-2,6- dicarboxylic acid and pipz is piperazine, was obtained by reaction of Bi(NO3)3·5H2O with (pipzH2)(pydc-H)2·3H2O in a 1:2 molar ratio in aqueous solution. There are two independent BiIII atoms in the structure, one of which is eight-coordinate with a distorted bicapped trigonal-prismatic geometry, and another which is nine-coordinate with a distorted tricapped trigonal-prismatic geometry. The carboxyl-ate groups of the (pydc)2- ligands link dinuclear [Bi2(C7H3NO4)4(H2O)]2- units into one-dimensional coordin-ation polymers. The pipzH2 2+ cations (site symmetry ) and non-coordinated water mol-ecules lie between these polymers, forming N - H⋯O and O - H⋯O hydrogen bonds to the O atoms of the carboxylate groups. © 2008 International Union of Crystallography.