Crystal structure of tritin(II) dihydroxide oxide sulphate

Abstract

The crystal structure of the title compound has been determined from X-ray diffractometer data by Patterson and Fourier methods. Crystals are orthorhombic and piezoelectric, space group Pbc2₁ with Z= 4 in a unit cell of dimensions a= 4.983 ± 0.002, b= 13.1 28 ± 0.005, c= 1 2.214 ± 0.005 Å. The structure was refined by least-squares methods to R 0.028 for 1 070 reflections. The structure contains discrete ring [Sn₃O(OH)₂]²⁺ basic ions which have Sn in two different environments : one Sn is bonded to all three ring oxygens to give trigonal pyramidal co-ordination with short Sn–O, and the remaining Sn atoms are bonded to two ring O atoms with short Sn-O (<2.1 6 Å), and has O atoms from two separate SO₄ groups at longer (>2.40 Å) distances. These latter Sn atoms have distorted square-pyramidal oxygen environments. The bonds between the SO₄ groups and the basic ion Sn atoms result in the formation of a layer structure.