The synthesis and crystal structures of three halopyridinium halometallate salts are reported. (4-ClpyH)2[PdCl4] (1) and (4-ClpyH)2[Cu3Cl8] (2) adopt tape structures closely resembling a series of hydrogen-bonded structures that contain either dications such as 4,4-bipyridinium or their supramolecular analogues. This requires a short interaction between cations via a symmetric C–Cl⋯Cl–C arrangement that is most probably repulsive. The third compound, (4-BrpyH)2[PtCl6] (3), forms a 3-D network structure that involves not only bifurcated N–H⋯[Cl(Pt)]2 hydrogen bonds but also uncommon bifurcated C–Br⋯[Cl(Pt)]2 halogen bonds. This set of structures provides unanticipated extensions to established homologous series of hydrogen-bonded halometallate salts.
