Crystal structure of a CoII coordination polymer with a dipyridyl ligand: catena-polybis­(nitrato-κ2OO′)cobalt(II)-μ-N-(pyridin-2-ylmeth­yl)pyridine-3-amine-κ3NN′:N′′

摘要

The asymmetric unit of the title compound, [Co(NO3)2 L]n, L = N-(pyridine-2-ylmeth­yl)pyridine-3-amine (C11H11N3), contains one Co^II centre, two nitrate anions and one L ligand in which the Cpy—C—N—Cpy 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 η²-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.