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The structure of the title compound, [N(C 2 H 5 ) 4 ] 2 [Co 2 (C 2 N 3 ) 5 (H 2 O) 4 ](C 2 N 3 ), 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.

acta crystallographica. section e, crystallographic communications

Crystal structure ofcatena-poly[bis(tetraethylammonium) [tetraaquatris(μ-dicyanamido-κ2N1:N5)bis(dicyanamido-κN1)dicobaltate(II)] dicyanamide]