2-Acetyl­pyridinium 3-amino-2-chloro­pyridinium tetra­chloridocobaltate(II)

In the title complex, (C(5)H(6)ClN(2))(C(7)H(8)NO)[CoCl(4)], the Co(II) ions are tetra­hedrally coordinated. The crystal structure is built from hydrogen-bonded centrosymmetric tetra­mers of tetra­chloridocobaltate(II) dianions and 3-amino-2-chloro­pyridinium cations, additionally strengthened by significant π–π stacking of pyridinium rings [interplanar distance 3.389 (3) Å]. The tetra­mers are linked by N—H⋯Cl hydrogen bonds into chains; the second kind of cations, viz. 2-acetyl­pyridinium, are connected by N—H⋯Cl hydrogen bonds to both sides of the chain. The Co—Cl bond lengths in the dianion correlate with the number of hydrogen bonds accepted by the Cl atom. An intramolecular C—H⋯Cl interaction is also present.