Crystal structure of catena-poly[[[trans-bis(aceto-nitrile-κN)diaquacobalt(II)]-μ-pyrazine-κ(2) N:N'] dinitrate]

• Published in: Acta crystallographica. Section E, Crystallographic communications Vol. 72; no. Pt 2; pp. 151 - 154
• Main Authors: Liu, Chen, Felts, Ashley C, Thuijs, Annaliese E, Useche, Aaron, Abboud, Khalil A
• Format: Journal Article
• Language: English
• Published: England 01.02.2016
• Subjects: aceto­nitrile ligand; crystal structure; one dimensional coordination polymer; cobalt(II) complex; pyrazine ligand
• ISSN: 2056-9890; 2056-9890
• DOI: 10.1107/S2056989016000220

The central structural motif of the title coordination polymer, [Co(NO3)2(C4H4N2)(CH3CN)2(H2O)2] n , is a chain composed of Co(II) ions linked by bis-monodentate bridging pyrazine ligands through their N atoms. The Co(II) ion is located on an inversion center and is additionally coordinated by two O atoms of water mol-ecules and two N atoms of aceto-nitrile mol-ecules. The resultant N4O2 coordination sphere is distorted octa-hedral. The linear cationic chains extend parallel to the a axis and are aligned into layers parallel to the ac plane. Nitrate anions are situated in the space between the Co(II) chains and form O-H⋯O hydrogen bonds with the coordinating water mol-ecules, leading to a three-dimensional network structure. Weak C-H⋯O hydrogen bonds are also present between pyrazine or aceto-nitrile mol-ecules and the nitrate anions.