Crystal structure of a Co coordination polymer with a dipyridyl ligand: -poly[[bis-(nitrato-κ,')cobalt(II)]-μ--(pyridin-2-ylmeth-yl)pyridine-3-amine-κ,':''].

The asymmetric unit of the title compound, [Co(NO)] , = -(pyridine-2-ylmeth-yl)pyridine-3-amine (CHN), contains one Co centre, two nitrate anions and one ligand in which the C-C-N-C moiety adopts a conformation with a torsion angle of -173.1 (3) Å. The coordination geometry of the Co atom is a distorted penta-gonal bipyramid. One amine N atom from the ligand and four O atoms from two η-nitrato ligands form the basal plane and two pyridyl N atoms from two symmetry-related ligands occupy the apical positions [N-Co-N = 171.86 (11)°]. The displacement of the central Co atom from the basal plane (r.m.s. deviation = 0.085 Å) is 0.1491 (12) Å. Each bidentate nitrate group is bonded asymmetrically to the cobalt atom in an chelating fashion. The Co ions are linked by the ligands to form a zigzag chain propagating along the -axis direction. Within the zigzag chain, C-H⋯O hydrogen bonds between the ligands and the nitrate anions are observed. Adjacent zigzag chains are connected inter-molecular π-π stacking inter-actions [centroid-to-centroid distance = 3.844 (2) Å] between the pyridine rings together with N/C-H⋯O hydrogen bonds.