Homologous families of chloride-rich 4,4′-bipyridinium salt structuresElectronic supplementary information (ESI) available: synthesis details for 1–4, crystal refinement details and colour structures for 1, 2 and 4. See http://www.rsc.org/suppdata/cc/b0/b009467f/

Abstract

New layer and three-dimensional 4,4′-bipyridinium salts of Cl⁻, [MCl₆]²⁻ (M = Os, Pt) and [FeCl₅]²⁻ contain NH⋯(Cl)₂⋯HN interactions which form hydrogen bonded ribbons which in turn give one-, two-, or three-dimensional periodic networks; two related families of homologous motifs are present in these salts together with those of square planar, polymeric and tetrahedral [MCl₄]²⁻ (M = Pt, Pd, Mn, Cd, Pb, Co, Zn, Hg), planar [Cu₂Cl₆]²⁻ and square pyramidal [SbCl₅]²⁻ dianions.