Aquatrimethyl[2-(4-methylpyrimidin-2-ylsulfanyl)acetato-κO]tin(IV)

In the title compound, [Sn(CH3)3(C7H7N2O2S)(H2O)], the SnIV atom has a distorted trigonal–bipyramidal coordination geometry, with one carboxylate O atom of the 2-(4-methylpyrimidine-2-sulfanyl)acetate ligand and the O atom of a water molecule in axial positions, and three methyl groups in equatorial positions. In the crystal, molecules are linked via O—H⋯O and O—H⋯N hydrogen bonds, forming double-stranded chains propagating along [010].

In the title compound, [Sn(CH 3 ) 3 (C 7 H 7 N 2 O 2 S)(H 2 O)], the Sn IV atom has a distorted trigonal-bipyramidal coordination geometry, with one carboxylate O atom of the 2-(4-methylpyrimidine-2-sulfanyl)acetate ligand and the O atom of a water molecule in axial positions, and three methyl groups in equatorial positions. In the crystal, molecules are linked via O-HÁ Á ÁO and O-HÁ Á ÁN hydrogen bonds, forming doublestranded chains propagating along [010].
illustrates that the three methyl C atoms and the tin atom are nearly coplanar. The Sn-O distances of 2.144 (4) Å and 2.488 (5) Å, are a little longer than the covalent bond length of tin and oxygen (Zhang et al., 2007) Table 1 and Fig. 2.

Experimental
The reaction was carried out under an atmosphere of nitrogen. 4-methylpyrimidine-2-thioglycolic acid (1 mmol) and sodium ethanol (1 mmol) were added to a stirred solution of ethanol (30 ml) in a Schlenk flask and stirred for 30 min.
Trimethyltin chloride (1 mmol) was then added to the reactor and the reaction mixture was stirred for 12 h at 353 K. The

Refinement
The water molecule H atoms were placed in calculated positions and treated as riding atoms: O-H = 0.85 Å with U iso (H) = 1.5U eq (O). The C-bound H atoms were also placed in calculated positions and treated as riding atoms: C-H = 0.93 and 0.96 Å, for CH and CH 3 H atoms, respectively, with U iso (H) = 1.5U eq (C-methyl) and = 1.2U eq (C) for other H atoms. In the final cycles of refinement two reflections were omitted as (I obs -I calc )/ΣW > 10.

Special details
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell esds are taken into account in the estimation of distances, angles and torsion angles Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2sigma(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.