catena-Poly[[di­chlorido­mercury(II)]-μ-1,4-bis­[2-(pyridin-4-yl)ethyn­yl]benzene-κ²N:N′]

In the polymeric title compound, [HgCl₂(C₂₀H₁₂N₂)]_n, the Hg^II atom is located on a twofold rotation axis and the benzene ring of the bidentate bridging 1,4-bis­[2-(pyridin-4-yl)ethyn­yl]benzene (L) ligand is located about a twofold rotation axis. The Hg^II atom is coordinated by two N atoms of two different L ligands and by two chloride ions in a distorted tetra­hedral geometry. The dihedral angle between the coordinating pyridine and the benzene ring is 12.8 (2)°. The result of the bridging is the formation of a zigzag chain running parallel to [102]. The chains pack with no specific inter­molecular inter­actions between them.