(1RS,2RS)-4,4′-(1-Aza­niumyl-2-hy­droxy­ethane-1,2-di­yl)dipyridinium tetra­chlorido­platinate(II) chloride

The title compound, (C₁₂H₁₆N₃O)[PtCl₄]Cl, consists of a 4,4′-(1-aza­niumyl-2-hy­droxy­ethane-1,2-di­yl)dipyridinium trication, a square-planar tetra­chloridoplatinate(II) dianion and a chloride ion. In the cation, the pyridinium rings attached to the central 1-aza­niumyl-2-hy­droxy­ethane fragment have an anti conformation, as indicated by the central C—C—C—C torsion angle of −166.5 (6)°, and they are inclined to one another by 63.5 (4)°. In the crystal, the cations and anions are linked through N—H...Cl and O—H...Cl hydrogen bonds. There are also π–π contacts [centroid–centroid distances = 3.671 (4) and 3.851 (4) Å] and a number of C—H...Cl inter­actions present, consolidating the formation of a three-dimensional supra­molecular structure.