Monoclinic polymorph of chlorido­(dimethyl sulfoxide-κO)tri­phenyl­tin(IV)

The crystal structure of the title tin complex, [Sn(C(6)H(5))(3)Cl(C(2)H(6)OS)], (I), has been reported with one mol­ecule in the asymmetric unit in an ortho­rhom­bic cell [Kumar et al. (2009 ▸). Acta Cryst. E65, m1602–m1603]. While using SnPh(3)Cl as a starting material for a reaction for which the products were recrystallized over a very long time (six months) from dimethyl sulfoxide (DMSO), a new polymorph was obtained for (I), with two independent mol­ecules in the asymmetric unit of a monoclinic cell. The coordination geometry of the Sn centres remains unchanged, with the Cl(−) ion and the DMSO mol­ecule in the apical positions and the phenyl C atoms in the equatorial positions of a trigonal bipyramid. The main difference between the polymorphs is the relative orientation of the phenyl rings in the equatorial plane, reflecting a degree of free rotation of these groups about their Sn—C bonds. In the crystal, mol­ecules are linked into [010] chains mediated by weak C—H⋯O inter­actions.