Bis(2,6-dimethylpyridinium) hexachloridoplatinate(IV)

The asymmetric unit of the title compound, (C7H10N)2[PtCl6], contains one independent protonated 2,6-dimethylpyridinium cation and half of a centrosymmetric [PtCl6]2− anion. The Pt atom has an octahedral coordination. In the crystal structure, intermolecular N—H⋯Cl and C—H⋯Cl hydrogen bonds result in the formation of a supramolecular structure. There is a π–π contact between the pyridine rings [centroid–centroid distance = 4.235 (1) Å].

The asymmetric unit of the title compound, (C 7 H 10 N) 2 [PtCl 6 ], contains one independent protonated 2,6-dimethylpyridinium cation and half of a centrosymmetric [PtCl 6 ] 2À anion. The Pt atom has an octahedral coordination. In the crystal structure, intermolecular N-HÁ Á ÁCl and C-HÁ Á ÁCl hydrogen bonds result in the formation of a supramolecular structure. There is acontact between the pyridine rings [centroid-centroid distance = 4.235 (1) Å ].
The asymmetric unit of (I), (Fig. 1) contains one independent protonated 2,6-di-methylpyridinium cation and half of a centrosymmetric [PtCl 6 ] 2anion. The Pt ion has an octahedral coordination. In cation, the bond lengths and angles are in good agreement with the corresponding values in (II) and (IV). In [PtCl 6 ] 2anion, the Pt-Cl bond lengths and Cl-Pt-Cl bond angles (Table 1) are also within normal ranges, as in (XXI), (XXII) and (XXIII).

supplementary materials sup-2 Experimental
For the preparation of the title compound, a solution of 2,6-dimethylpyridine (0.16 g, 1.48 mmol, 0.17 ml) in methanol (15 ml) was added to a solution of H 2 PtCl 6 .6H 2 O, (0.38 g, 0.74 mmol) in acetonitrile (15 ml) and the resulting yellow solution was stirred for 10 min at 313 K. Then, it was left to evaporate slowly at room temperature. After one week, orange prismatic crystals of were isolated (yield; 0.34 g; 73.6%).

Refinement
H1D atom (for NH) was located in difference syntheses and refined isotropically [N-H = 0.85 (7) Å and U iso (H) = 0.029 (17) Å 2 ]. The remaining H atoms were positioned geometrically, with C-H = 0.93 and 0.96 Å for aromatic and methyl H, respectively, and constrained to ride on their parent atoms with U iso (H) = 1.2U eq (C). Fig. 1. The molecular structure of the title molecule, with the atom-numbering scheme. Displacement ellipsoids are drawn at the 40% probability level [symmetry code: (a) -x, 1 -y, -z].

Bis(2,6-dimethylpyridinium) hexachloridoplatinate(IV)
Crystal data (C 7  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.
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )