Poly[bis[μ4-N-(2-hydroxyiminopropionyl)-N′-(2-oxidoiminopropionyl)propane-1,3-diaminato]dimethanolcalciumdicopper(II)]

In the title compound, [CaCu2(C9H13N4O4)2(CH3OH)2]n, the CaII atom lies on an inversion center and is situated in a moderately distorted octahedral environment. The CuII atom is in a distorted square-pyramidal geometry, defined by four N atoms belonging to the amide and oxime groups of the triply deprotonated residue of N,N′-bis(2-hydroxyiminopropanoyl)propane-1,3-diamine (H4pap) and one oxime O atom from a neighboring Hpap ligand at the apical site, forming a dimeric [Cu2(Hpap)2]2 unit. Each dimeric unit connects four Ca atoms and each Ca atom links four [Cu2(Hpap)2]2 units through Ca—O(amide) bonds, leading to a three-dimensional framework. The crystal structure involves intra- and intermolecular O—H...O hydrogen bonds.