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

Chen Liu; Ashley C Felts; Annaliese E Thuijs; Aaron Useche; Khalil A Abboud

doi:10.1107/S2056989016000220

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

Acta Crystallogr E Crystallogr Commun. 2016 Jan 13;72(Pt 2):151-4. doi: 10.1107/S2056989016000220. eCollection 2016 Feb 1.

Authors

Chen Liu¹, Ashley C Felts², Annaliese E Thuijs², Aaron Useche¹, Khalil A Abboud²

Affiliations

¹ Department of Chemistry and Environmental Science, Grenfell Campus, Memorial University of Newfoundland, Corner Brook, NL, A2H 5G4, Canada.
² Department of Chemistry, University of Florida, Gainesville, FL, 32611-7200, USA.

Abstract

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.

Keywords: acetonitrile ligand; cobalt(II) complex; crystal structure; one dimensional coordination polymer; pyrazine ligand.