[μ-2,2′-Dimethyl-2,2′-(p-phenylene)dipropyl]bis[chloridobis(2-methyl-2-phenylpropyl)tin(IV)]

The molecular structure of the title compound, [Sn2(C10H13)4(C14H20)Cl2], is a binuclear centrosymmetric complex, in which the Sn atoms are four-coordinated by three C atoms and one Cl atom in a distorted tetrahedral geometry.

The molecular structure of the title compound, [Sn 2 (C 10 H 13 ) 4 (C 14 H 20 )Cl 2 ], is a binuclear centrosymmetric complex, in which the Sn atoms are four-coordinated by three C atoms and one Cl atom in a distorted tetrahedral geometry.

Experimental
A small iodine grain, magnesium powder(0.24 g 10 mmol), and 1,4-bis(1-chloro-2-methylpropan-2-yl)benzene (0.52 g, 2 mmol) were added to 2 ml of anhydrous ether under stirring. The reaction mixture is then heated to 50 -60°C by hot-water bath and maintained slight boiling state. When the purplish red of iodine disappeared, which indicated the reaction were initiated, the hot-water bath was removed. The reaction were keeping the slight boiling state, then a solution of 1,4-bis(1chloro-2-methylpropan-2-yl)benzene (2.59 g, 10 mmol) in 10 ml anhydrous ether were added dropwise. After finished, the mixture was refluxed for 1 h to allow magnesium to proceed to completion, then cooled to 0-5°C by ice-salt bath. A solution of dichlorobis(2-methyl-2-phenylpropyl)stannane (4.56 g,10 mmol) in 15 mL THF were then added dropwise. After finished, the ice-salt bath was removed, and the reaction mixture were stirred for 0.5 h at room temprature then refluxed for another 1.5 h. Finally, the mixture were again cooled to 0°C, and acidified by dropwise adding a solution containing 2.5 g fuming HCl and 15 ml water. The layers were separated, the organic phase was dried over anhydrous calcium chloride.
Following filtration and evaporation of the solvent, the residue was recrystallized by THF and the colorless block crystals of (I) were abtained.

Refinement
All H atoms on C atoms were positioned geometrically (C-H = 0.93 Å) and refined as riding, with U iso (H)=1.2U eq (carrier).
supplementary materials sup-2 Figures Fig. 1. The molecular structure of (I), showing 30% probability displacement ellipsoids. H atoms have been omitted for clarity. Scheme 1. The chemical structure diagram of (I). Scheme 2. The reaction scheme for synthesis of (I).
Crystal data [

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
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 > σ(F 2 ) is used only for calculating Rfactors(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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq