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Cobalt(II) nitrate hexa­hydrate and sodium dicyanamide self-assembled in dimethyl­formamide (DMF) and 4-methyl­pyridine solutions to form the title compound, [Co(C 2 N 3 ) 2 (C 6 H 7 N) 2 ]  n  . The Co 2+  ion lies on an inversion center and adopts an octa­hedral coordination geometry in which four N atoms from four different dicyanamide ligands lie in the equatorial plane and two 4-methyl­pyridine N atoms occupy the axial positions. The Co II  atoms are connected by two bridging dicyanamide ligands, resulting in a chain parallel to the  c  axis. The chains are connected into a three-dimensional network by C—H⋯N hydrogen bonds.

catena-Poly[[bis(4-methylpyridine-κN)cobalt(II)]-di-μ-dicyanamido-κ2N1:N5]

catena-Poly[[bis(4-methylpyridine-κN)cobalt(II)]-di-μ-dicyanamido-κ²N¹:N⁵]