Bis{μ-6,6′-dimethoxy-2,2′-[propane-1,2-diylbis(iminomethylene)]diphenol-ato}bis[apuacopper(II)] dihydrate

In the title compound, [Cu-2(C19H24N2O4)(2)(H2O)(2)]center dot 2H(2)O, the asymmetric unit consists of one half of the bis{mu-6,6'dimethoxy-2,2'-[propane-1,2-diylbis(iminomethylene)] diphenol-ato}bis[aquacopper(II)] complex and two water molecules. Two Cu-II centres are bridged through a pair of phenolate groups, resulting in a complex with a centrosymmetric structure, with the centre of inversion at the middle of the Cu2O2 plane. The Cu atoms are in a slightly distorted square-pyramidal coordination environment (tau = 0.07). The average equatorial Cu-O bond length and the axial Cu-O bond length are 1.928 (3) and 2.486 (3) angstrom, respectively. The CuO(water) bond length is 2.865 (4) angstrom, so the compound could be described as having a weakly coordinating water molecule at each Cu-II ion and two solvent water molecules per dimetallic unit. The Cu center dot center dot center dot Cu distance and Cu-O-Cu angle are 3.0901 (10) angstrom and 87.56 (10)degrees, respectively. The molecules are linked into a sheet by O-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds parallel to the [001] plane.