catena-Poly[[aquabis{4-[2-(2,4-dioxopentan-3-ylidene)hydrazin-1-yl]benzoato-κO}copper(II)]-μ-N,N-diethylpyridine-3-carboxamide-κ2N1:O]

The Cu(II) atom in the title compound, [Cu(C(12)H(11)N(2)O(4))(2)(C(10)H(14)N(2)O)(H(2)O)](n), lies in a square plane defined by the O atoms of the carboxyl-ate ions, the N atom of the N-heterocycle and the water mol-ecule. Coordination by an amido O atom of an adjacent N-heterocycle in the apical direction leads to a polymeric chain running along [01[Formula: see text]]. The chain motif is consolidated by hydrogen bonds involving the water mol-ecule; the water mol-ecule is a hydrogen-bond donor to the free carbonyl atoms of the carboxyl-ate ions. Intra-molecular N-H⋯O hydrogen bonds also occur.