catena-Poly[bis­(1,3-benzo­thia­zol-3-ium) [di­chlorido­anti­monate(III)]-di-μ-chlorido-μ-oxido-[chlorido­anti­monate(III)]-μ-chlorido]

The title compound, {(C7H6NS)2[Sb2Cl6O]}n, contains two benzo­thia­zolidium cations and one tri-μ-chlorido-tri­chlorido-μ-oxido-di­anti­monate(III) anion. The structure of the inorganic cation may be described as as being built up from two polyhedra, i.e. a square-pyramidal SbCl4O and a distorted octa­hedral SbOCl5 unit, sharing a common face (comprising the O atom and two Cl atoms). The two benzo­thia­zole cations are quasi-planar and subtend a dihedral angle of 19.93 (5)°. The crystal packing can be described by alternating (100) layers and [001] chains of the organic cations and inorganic anions connected through an extensive three-dimensional network of N—H⋯Cl, C—H⋯O and C—H⋯Cl hydrogen bonds. This is consolidated by slipped π–π stacking, with centroid-to-centroid distances between the benzo­thia­zole rings of 3.7111 (18)–3.8452 (16) Å. These inter­actions link the mol­ecules within the layers and also link the layers together and reinforce the cohesion of the ionic structure