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 ′:′′

초록

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 = 0.085Å) 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. © Moon et al. 2017.

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