catena‐Poly­[[[di­aqua­bis(5‐chloro­pyridinium‐2‐olato‐κO)copper(II)]‐μ‐pyrazine‐κ2N:N′] diperchlorate]

In the title compound, Cu(C₅H₄ClNO)₂(C₄H₄N₂)(H₂O)₂](ClO₄)₂, the Cu atom, which lies on an inversion centre, has an octahedral environment. The pyrazine ligand also lies about an inversion centre and links adjacent Cu atoms into a chain running along the b axis; perchlorate anions occupy the space between the chains, and the chains use the coordinated water mol­ecules to link to the anions, resulting in a hydrogen‐bonded ribbon structure. The donor 5‐chloro‐2‐hydroxy­pyridine ligand exists in the zwitterionic form, i.e. 5‐chloro­pyridinium‐2‐olate.