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The title compound, [CoCl2(C5H5N)2(C12H6N2O2)]·2C5H5N, is a neutral CoII complex with two chloride anions coordinated in a cis fashion, two pyridine ligands in trans positions and a chelating 1,10-phenanthroline-5,6-dione ligand that completes the octa­hedral coordination geometry. Two pyridine solvent mol­ecules reside in channels (about 7 × 4 Å wide; the closest atom-atom distance within the channel is 10 Å). The three-dimensional structure supporting these channels is held together by C-H...Cl [3.466 (8)-3.670 (9) Å] and C-H...O [3.014 (9)-3.285 (8) Å] hydrogen bonds, and can be viewed as a CsCl or bcu (body-centred cubic) net.

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In the crystal structures of the title compounds, C12H12N42+·2BF4-, (I), and C12H11N4+·ClO4-, (II), respectively, infinite two- and one-dimensional architectures are built up via N-H...F [in (I)] and conventional N-H...N [in (II)] hydrogen bonding. The N-N single bond in (I) lies on a crystallographic centre of symmetry; as a result, the two pyridinium rings are parallel. In (II), the pyridinium and pyridyl ring planes are inclined with a dihedral angle of 14.45 (3)°.
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