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

ABSTRACT: The asymmetric unit of the title compound, [Co(NO₃)₂L] _n , L = N-(pyridine-2-ylmeth-yl)pyridine-3-amine (C₁₁H₁₁N₃), 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 penta-gonal bipyramid. One amine N atom from the L ligand and four O atoms from two ?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 inter-molecular ?-? stacking inter-actions [centroid-to-centroid distance = 3.844?(2)?Å] between the pyridine rings together with N/C-H?O hydrogen bonds.

SUBMITTER: Moon SH 

PROVIDER: S-EPMC5683493 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature