Crystal structure of di-µ3-oxo-octakis-µ-(trifluoroacetato)-ditin(II)ditin(IV)–benzene (1/1)

Abstract

The crystal and molecular structure of [Sn^IISn^IVO(O₂CCF₃)₄]₂·C₆H₆ has been determined by single-crystal X-ray crystallography to R′= 0.058. Crystals are monoclinic, space group C_2/c, with a= 24.182(10), b= 9.828(3), c= 17.882(6)Å, β= 104.77(3)°, and Z= 4. The molecular structure consists of independent centrosymmetric [Sn^IISn^IVO(O₂CCF₃)₄]₂ units. The two symmetry-related tin(IV) atoms are bridged by two µ₃-oxygen atoms to form a Sn^IV₂O₂ ring. Octahedral co-ordination at Sn^IV is completed by trifluoroacetates which bridge the Sn^IV and Sn^II. 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)–Sn^II–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.