Crystal structure of a looped-chain Co^II coordination polymer: catena-poly[[bis-(nitrato-?O)cobalt(II)]bis-[?-bis-(pyridin-3-ylmeth-yl)sulfane-?²N:N']].

ABSTRACT: The asymmetric unit of the title compound, [Co(NO₃)₂(C₁₂H₁₂N₂S)₂] _n , contains a bis-(pyridin-3-ylmeth-yl)sulfane (L) ligand, an NO₃^- anion and half a Co^II cation, which lies on an inversion centre. The Co^II cation is six-coordinated, being bound to four pyridine N atoms from four symmetry-related L ligands. The remaining coordination sites are occupied by two O atoms from two symmetry-related nitrate anions in a monodentate manner. Thus, the Co^II centre adopts a distorted octa-hedral geometry. Two symmetry-related L ligands are connected by two symmetry-related Co^II cations, forming a 20-membered cyclic dimer, in which the Co^II atoms are separated by 10.2922?(7)?Å. The cyclic dimers are connected to each other by sharing Co^II atoms, giving rise to the formation of an infinite looped chain propagating along the [101] direction. Inter-molecular C-H?? (H?ring centroid = 2.89?Å) inter-actions between one pair of corresponding L ligands and C-H?O hydrogen bonds between the L ligands and the nitrate anions occur in the looped chain. In the crystal, adjacent looped chains are connected by inter-molecular ?-? stacking inter-actions [centroid-to-centroid distance = 3.8859?(14)?Å] and C-H?? hydrogen bonds (H?ring centroid = 2.65?Å), leading to the formation of layers parallel to (101). These layers are further connected through C-H?O hydrogen bonds between the layers, resulting in the formation of a three-dimensional supra-molecular architecture.

SUBMITTER: Moon SH 

PROVIDER: S-EPMC5683494 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature