Bis(1,3-thiazol-2-aminium) hexachloridostannate(IV)

The asymmetric unit of the title compound, (C3H5N2S)2[SnCl6], contains one cation in a general position and one-half of the dianion situated on an inversion center. The geometry of the [SnCl6]2− dianion is almost regular octahedral. In the crystal, weak N—H⋯Cl and N—H⋯S hydrogen bonds and electrostatic forces link cations and anions into a three-dimensional framework.

The asymmetric unit of the title compound, (C 3 H 5 N 2 S) 2 [SnCl 6 ], contains one cation in a general position and one-half of the dianion situated on an inversion center. The geometry of the [SnCl 6 ] 2À dianion is almost regular octahedral. In the crystal, weak N-HÁ Á ÁCl and N-HÁ Á ÁS hydrogen bonds and electrostatic forces link cations and anions into a three-dimensional framework.
This title compound contains SnCl6 inorganic anions and organic cations. The SnCl6 inorganic anion adopts an octahedron geometry, with average Sn-Cl distance 2.4278 Å. The inorganic anion and organic cation are linked through N-H···Cl hydrogen bond.
In the crystal structure, intermolecular N-H···Cl and N-H···S hydrogen bonds link cations and anions into a threedimensioal framework. There are π-π stacking interactions involving the two thiazole rings, with a centroid···centroid distance of 3.769 (3) Å.

Experimental
2-aminothiazole (10 mmol) was dissolved to acid methanol solution (10 ml). Ten minutes later, an methanol solution (10 ml) of stannic chloride (5 mmol) was added with stirring. The mixture was stirred for 4 h. The solution was held at room temperature for about two weeks, whereupon yellow crystals suitable for X-ray diffraction analysis were obtained.

Refinement
All H-atoms were positioned geometrically and refined using a riding model, with C-H=0.93 Å (aromatic), N-H=0.89 Å (ammonium) and U iso (H) =1.2U eq (C), U iso (H) =1.5U eq (N)  Special details Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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 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.