Crystal structure of 4-chloropyridinium hexachlorostannate(IV)

Abstract

The title compound has been examined by single-crystal X-ray crystallography and crystallizes in the space-group P2₁/c with Z= 2 in a unit cell of dimensions a= 8·555, b= 16·962, c= 7·122 Å and β= 113·15° The structure was solved by conventional Fourier techniques and was refined anisotropically by full-matrix least-squares methods to R 0·039 using 1600 independent reflections measured by counter methods. The cation is regular and normal. The SnCl₆^2– ion is tetragonally distorted with three crystallographically inequivalent Sn–Cl bonds [2·414(4), 2·419(2), and 2·463(3)Å], the source of the distortion being Cl ⋯ H–N hydrogen bonding between the long Sn–Cl bonds of SnCl₆^2– and the cation. These results account very well for the marked splittings in the ³⁵Cl n.q.r. signals observed for this anion.