Bis(2-amino-3,5-dibromo-4,6-dimethyl­pyridinium) hexa­bromido­stannate(IV)

In the title compound, (C₇H₉Br₂N₂)₂[SnBr₆], the cations and centrosymmetric anions are stacked in alternating layers that show no significant inter­molecular inter­actions within each stack. Extensive cation...[SnBr₆]²⁻ inter­actions are found, represented by short Br...Br inter­actions, along with different Br...HN (pyridine and amine) and weaker Br...HCH₂ hydrogen-bonding motifs.

A novel framework of N—H...Br hydrogen bonds forming Br(4,4′-bipyridinium)₄ supra­molecular synthons: bis­(4,4′-bipyridinium) tris­[tetra­bromidoferrate(III)] bromide

In the asymmetric unit of the title compound, (C₁₀H₁₀N₂)₂[FeBr₄]₃Br, the Fe atoms are in a distorted tetra­hedral environment. The crystal structure contains a novel arrangement of Br(4,4′-bipyridinium)₄ supra­molecular synthons assembled via short N—H...Br hydrogen bonds (H...Br = 2.55, 2.40, 2.38 and 2.55 Å), where four cations surround one nonbonded bromide ion in a tetra­hedral arrangement. These synthons are further connected by hydrogen bonds using the remaining terminal NH hydrogens in each cation and the Br⁻ ions to form an adamantoid-like network and thus produce a three-dimensional supra­molecular architecture with the [FeBr₄]⁻ ions located in the cavities. The structure shows no significant inter­molecular Br...Br, Br...aryl or aryl–aryl inter­actions.