catena-Poly[[(benzil bis{[(pyridin-2-yl)methylidene]hydrazone}-κ⁴N,N′,N′′,N′′′)mercury(II)]-μ-chlorido-[dichloridomercury(II)]-μ-chlorido]

In the title coordination polymer, [Hg₂Cl₄(C₂₆H₂₀N₆)]_n, one Hg^II ion is coordinated by four N atoms from the benzylbis((pyridin-2-yl)methyl­idenehydrazone) ligand and two Cl⁻ ions in a very distorted cis-HgCl₂N₄ octa­hedral geometry. The other Hg^II ion is coordinated in a distorted tetra­hedral geometry by four Cl⁻ ions. Bridging chloride ions link the Hg^II ions into a chain propagating in [010]: the Hg—Cl bridging bonds are significantly longer than the terminal bonds. The dihedral angle between the central benzene rings of the ligand is 83.3 (2)°. The packing is consolidated by weak C—H...Cl hydrogen bonds and C—H...π inter­actions.