Polymeric μ,μ′-pyrazine-N,N′-bis(N-salicylidene-R,S-alaninato)copper(II) tetrahydrate

The Cu-II atom in the title compound, [Cu-2(C10H9NO3)(2)(C4H4N2)].4H(2)O, adopts a square-pyramidal coordination with the three donor atoms of the N-salicylidene-R,S-alaninato Schiff base dianion and one N atom of the pyrazine ligand bound in the basal plane. The axial position is occupied by a phenolate O atom of a symmetry-related ligand at an apical distance of 2.396 (2) Angstrom. The molecules are connected through the second Id atom of the pyrazine to form binuclear copper units, and are further linked through the above-mentioned apical coordinations into chains parallel to [100]. The water molecules help to form a hydrogen-bonding network between the chains. All copper polyhedra and the molecular axis are oriented parallel.