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

The structure of the title compound, [La(C5H6O4)(C5H7O4)‐(H2O)]·H2O, consists of dense layers formed by chains of one‐edge‐sharing LaO9(H2O) polyhedra, linked together by the glutarate ligand. The three‐dimensional polymeric structure, built up through connection of these layers by the hydrogen glutarate ligand, exhibits cavities accommodating a guest water mol­ecule. The lanthanum ion is tenfold coordinated by four glutarates, acting as bridging–chelating carboxyl­ate groups, by three hydrogen glutarates, three times monodentate, and by one water mol­ecule. Its coordination polyhedron is highly distorted and intermediate between a bicapped dodecahedron and a tetracapped 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) Å, links the proton­ated with the deprotonated acid groups in the hydrogen glutarate.