catena-Poly[[aqua­bis­{4-[2-(2,4-dioxopentan-3-yl­idene)hydrazin-1-yl]benzo­ato-κO}copper(II)]-μ-N,N-diethyl­pyridine-3-carboxamide-κ(2) N (1):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 carboxyl­ate ions, the N atom of the N-heterocycle and the water mol­ecule. Coordination by an amido O atom of an adjacent N-heterocycle in the apical direction leads to a polymeric chain running along [01[Image: see text]]. The chain motif is consolidated by hydrogen bonds involving the water mol­ecule; the water mol­ecule is a hydrogen-bond donor to the free carbonyl atoms of the carboxyl­ate ions. Intra­molecular N—H⋯O hydrogen bonds also occur.