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Acta Cryst. (2012). E68, m1437-m1438
[ doi:10.1107/S1600536812042882 ]

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

L. Reck and W. Schmitt

Abstract: The crystal structure of the title compound, {[AsCl3(C5H5N)]·H2O}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 AsIII 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 [psi]-octahedral fivefold coordination.

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