catena-Poly[[aquabis{4-[2-(2,4-dioxopentan-3-ylidene)hydrazin-1-yl]benzoato-κO}copper(II)]-μ-N,N-diethylpyridine-3-carboxamide-κ2 N 1:O]

The CuII atom in the title compound, [Cu(C12H11N2O4)2(C10H14N2O)(H2O)]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]. 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.

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 [011]. 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-HÁ Á ÁO hydrogen bonds also occur.

Related literature
For a related structure, see: Maharramov et al. (2011).

Experimental
Crystal data [Cu(C 12  H atoms treated by a mixture of independent and constrained refinement Á max = 1.14 e Å À3 Á min = À0.39 e Å À3 Table 1 Selected bond lengths (Å ).   [[aquabis{4-[2-(2,4-dioxopentan-3-ylidene) We have been investigating the adducts of 3-diethylpridine-3-carboxamide with copper(II) salts; a previous study reported the copper bis(thienoylacetonate) adduct (Maharramov et al., 2011). The reaction of the N-heterocycle with copper bis(4- [(2,4-dioxopentan-3-yl)diazenyl]benzoate in the presence of sodium bicarbonate yielded the title monoaqua mono-adduct (Scheme I). The Cu II atom lies in a square plane defined by the O atom of the carboxylate ions, the N atom of the N-heterocycle and the water molecule; coordination by the amido O atom of an adjacent N-heterocycle leads to a linear chain running along [0 1 -1]. The chain motif is consolidated by hydrogen bonds that involve the water molecule; the water molecule is hydrogen-bond donor to the the double-bond carbonyl O atom of the carboxylate ions (Table 1).

Refinement
Carbon-bound H-atoms were placed in calculated positions [C-H 0.93 to 0.98 Å; U(H) 1.2 to 1.5U(C)] and were included in the refinement in the riding model approximation.
The water and amino-H-atoms were located in a difference Fourier map, and were refined with distance restraints of O-H 0.84±0.01 and N-H 0.88 + 0.01 Å; their temperature factors were refined.