Crystal structure of catena-poly[bis-(tetra-ethyl-ammonium) [tetra-aqua-tris(μ-dicyanamido-κ2N1: N5)bis(dicyanamido-κ N1)di-cobaltate(II)] dicyanamide]

Chen Liu; Annaliese E Thuijs; Khalil A Abboud

doi:10.1107/S2056989016016637

Crystal structure of catena-poly[bis-(tetra-ethyl-ammonium) [tetra-aqua-tris(μ-dicyanamido-κ²N¹: N⁵)bis(dicyanamido-κ N¹)di-cobaltate(II)] dicyanamide]

Acta Crystallogr E Crystallogr Commun. 2016 Oct 21;72(Pt 11):1603-1606. doi: 10.1107/S2056989016016637. eCollection 2016 Nov 1.

Authors

Chen Liu¹, Annaliese E Thuijs², 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 structure of the title compound, [N(C₂H₅)₄]₂[Co₂(C₂N₃)₅(H₂O)₄](C₂N₃), is a new example of a metal-dicyanamide coordination polymer which exhibits a unique three-dimensional framework of covalently linked Co^II chains. All bridging dicyanamide ligands in the title structure are in the μ_1,5-bridging mode. The anionic Co^II-dicyanamide network is templated by tetra-ethyl-ammonium cations residing in a series of channels extending along the b axis where additional non-coordinating dicyanamidate anions are also located. The framework structure is further stabilized by O-H⋯N hydrogen bonding between aqua ligands and dicyanamido ligands or the dicyanamide anion. In addition, C-H⋯N inter-actions are present between the tetra-ethyl-ammonium cations and dicyanamide amide nitro-gen atoms.

Keywords: O—H⋯N hydrogen bonding; cation template; crystal structure; metal dicyanamide coordination polymer; tetraethylammonium.