Abstract
The crystal and molecular structure of [SnIISnIVO(O2CCF3)4]2·C6H6 has been determined by single-crystal X-ray crystallography to R′= 0.058. Crystals are monoclinic, space group C2/c, with a= 24.182(10), b= 9.828(3), c= 17.882(6)A, β= 104.77(3)°, and Z= 4. The molecular structure consists of independent centrosymmetric [SnIISnIVO(O2CCF3)4]2 units. The two symmetry-related tin(IV) atoms are bridged by two µ3-oxygen atoms to form a SnIV2O2 ring. Octahedral co-ordination at SnIV is completed by trifluoroacetates which bridge the SnIV and SnII. The tin(II) atoms have a distorted square-based-pyramidal geometry with the apical site occupied by a µ3-oxygen, and the basal positions by oxygens from bridging trifluoroacetates. The O(basal)–SnII–O(basal) angles range from 74.40(26) to 118.40(27)°. The remaining apical site is presumably occupied by a non-bonding electron pair. One lattice benzene molecule is present per unit.
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