catena-Poly[[[dichlorido(pyridin-1-ium-3-yl)arsenic(III)]-μ-chlorido] mono­hydrate]

The crystal structure of the title compound, {[AsCl(3)(C(5)H(5)N)]·H(2)O}(n), is characterized by polymeric chains consisting of alternating arsenic and chlorine atoms running parallel to the a axis. O—H⋯Cl and N—H⋯O hydrogen bonds mediated by non-coordinating water mol­ecules assemble these chains into a three-dimensional framework. The As(III) atom, the atoms of the pyridinium ring and the water O atom have m site symmetry and the bridging Cl atom has site symmetry 2. This is the first reported organotrichloro­arsenate(III) in which arsenic adopts a ψ-octa­hedral fivefold coordination.