Crystal structure of a Co(II) coordination polymer with a dipyridyl ligand: catena-poly[[bis­(nitrato-κ(2) O,O′)cobalt(II)]-μ-N-(pyridin-2-ylmeth­yl)pyridine-3-amine-κ(3) N,N′:N′′]

The asymmetric unit of the title compound, [Co(NO(3))(2) L](n), L = N-(pyridine-2-ylmeth­yl)pyridine-3-amine (C(11)H(11)N(3)), contains one Co(II) centre, two nitrate anions and one L ligand in which the C(py)—C—N—C(py) moiety adopts a trans conformation with a torsion angle of −173.1 (3) Å. The coordination geometry of the Co(II) atom is a distorted penta­gonal bipyramid. One amine N atom from the L ligand and four O atoms from two η(2)-nitrato ligands form the basal plane and two pyridyl N atoms from two symmetry-related L ligands occupy the apical positions [N—Co—N = 171.86 (11)°]. The displacement of the central Co(II) 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(II) ions are linked by the L ligands to form a zigzag chain propagating along the c-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 via inter­molecular π–π stacking inter­actions [centroid-to-centroid distance = 3.844 (2) Å] between the pyridine rings together with N/C—H⋯O hydrogen bonds.