Wen-Jie Feng

The directional polymeric chain of [(BiCl5)2−]n in 2,2′-Bi(2-1H-imidazolium) pentachlorobismuthate dihydrate

The title compound, (C6H6N4)(BiCl5) · 2H2O, is built up by 2,2′-bi(2-1H-imidazolium) dications and (BiCl5)2− anions. Distorted BiCl6 octahedra are joined with each other alternatively to form [(BiCl5)2−]n polymeric chains, where the bridging chlorine atoms are shared by two octahedra. The lone pair at the Bi atom shows obviously stereochemical activity, leading to distortion of the BiCl6 octahedra and formation of the chain directionality. In solid state, the chains are stabilized by O-H···Cl and C-H···Cl hydrogen bonds.

Doxofyllinium tetra­chloridoanti­monate(III) monohydrate

The title compound, (C11H14N4O4)[SbCl4]·H2O, comprises a protonated doxofyllinium cation [7-(1,3-dioxolan-2-ylmethyl)-1,3-dimethyl-2,6-dioxo-3,7-dihydro-1H-purin-9-ium], an [SbCl4]− anion and a water molecule linked by N—H⋯O and O—H⋯Cl hydrogen bonds: the [SbCl4]− anions form centrosymmetric dimers via weak Sb⋯Cl interactions [Sb⋯Cl = 3.1159 (9) Å]. The geometrical arrangement in the crystal structure is characterized by slipped π–π stacking of the parallel purine ring systems, with an interplanar separation of 3.32 Å.

Bis(dimethyl­oxonium) penta­chlorido­antimonate(III)

The title compound, (C2H7O)2[SbCl5], contains one-half of an [SbCl5]2− anion lying on a mirror plane and one C2H7O+ cation in the asymmetric unit. The ion pairs are linked togather by strong O—H⋯Cl hydrogen bonds. The [SbCl5]2− anions are also linked through coordinated Sb—Cl bonds to form parallel chains.