Poly[bis{l-N0-[(pyridin-4-yl)methyl- idene]benzohydrazidato}copper(II)]

R factor = 0.033; wR factor = 0.080; data-to-parameter ratio = 15.4. In the title complex, [Cu(C13H10N3O)2]n, the copper(II) cation is located on a crystallographic inversion centre and adopts an elongated octahedral coordination geometry with the equa-torial plane provided by trans-arranged bis-N,O-chelating acylhydrazine groups from two ligands and the apices by the N atoms of two pyridine rings belonging to symmetry-related ligands. The ligand adopts a Z conformation about the C N double bond. The dihedral angle between the pyridine and phenyl rings is 2.99 (13). An intraligand C—H N hydrogen bond is observed. In the crystal, each ligand bridges two adjacent metal ions, forming a (4,4) grid layered structure. – stacking interactions [centroid–centroid distances in the range 3.569 (4)–3.584 (9) Å] involving rings of adjacent layers result in the formation of a three-dimensional supramolecular network. Related literature For background to properties and applications of Schiff base– metal complexes, see: Schurig et al. (1980); Siddall et al. (1983); Maurya et al. (2005); Cozzi (2004); Liu et al. (2010). For the structures of related compounds, see: Yin (2008); Uçar et al