Polymeric aqua(glutarato)(hydrogen glutarato)lanthanum(III) monohydrate

The structure of the title compound, [La(C5H6O4)(C5H7O4)(H2O)] . H2O, consi sts of dense layers formed by chains of one-edge-sharing LaO9 (H2O) polyhed ra, linked together by the glutarate ligand. The three-dimensional polymeri c structure, built up through connection of these layers by the hydrogen gl utarate ligand, exhibits cavities accommodating a guest water molecule. The lanthanum ion is tenfold coordinated by four glutarates, acting as bridgin g-chelating carboxylate groups, by three hydrogen glutarates, three times m onodentate, and by one water molecule. Its coordination polyhedron is highl y distorted and intermediate between a bicapped dodecahedron and a tetracap ped trigonal prism. Hydrogen bonding links the two water molecules and the framework built up from this polynuclear coordination polymer. A very short hydrogen bond, D ... A = 2.484 (3) Angstrom, links the protonated with the deprotonated acid groups in the hydrogen glutarate.