Bis(pyridinium) tetra-chlorido-zincate(II), [Hpy]2[ZnCl4].

Single crystals of the title compound, (C5H6N)2[ZnCl4] or [Hpy]2[ZnCl4], were grown from an aqueous solution of pyridinium chloride and zinc dichloride. The compound is isostructural with the corresponding cobalt compound and exhibits an almost tetra-hedral [ZnCl4]2- anion and two different pyridinium cations. The structure is described with respect to the bond lengths and angles of the anion and the π-π inter-actions between the cations, whilst mention is made of the N-H⋯Cl and C-H⋯Cl inter-actions already known from the cobalt compound.