Organic-inorganic hybrid hexa-chlorido-stannate(IV) with 2-methyl-imidazo[1,5- a]pyridin-2-ium cation

Abstract

The hybrid salt bis-(2-methyl-imidazo[1,5-a]pyridin-2-ium) hexa-chlorido-stannate(IV), (C₈H₉N₂)₂[SnCl₆], crystallizes in the monoclinic space group P2₁/n with the asymmetric unit containing an Sn_0.5Cl₃ fragment (Sn site symmetry ) and one organic cation. The five- and six-membered rings in the cation are nearly coplanar; bond lengths in the pyridinium ring of the fused core are as expected; the C-N/C bond distances in the imidazolium entity fall in the range 1.337 (5)-1.401 (5) Å. The octa-hedral SnCl₆ ^2- dianion is almost undistorted with the Sn-Cl distances varying from 2.4255 (9) to 2.4881 (8) Å and the cis Cl-Sn-Cl angles approaching 90°. In the crystal, π-stacked chains of cations and loosely packed SnCl₆ ^2- dianions form separate sheets alternating parallel to (101). Most of the numerous C-H⋯Cl-Sn contacts between the organic and inorganic counterparts with the H⋯Cl distances above the van der Waals contact limit of 2.85 Å are considered a result of crystal packing.

Keywords: 2-pyridine­carbaldehyde; crystal structure; hybrid salt; tin(IV).

Figure 1

Mol­ecular structure of (I) with atom labelling showing 50% displacement ellipsoids. [Symmetry code: (i) −x + 1, −y + 1, −z + 1.]

Figure 2

Projection of the crystal packing of (I) on the bc plane showing organic and inorganic sheets alternating parallel to the (101) plane.

Figure 3

Fragment of the π-stacked chain built of pairs of L ⁺ cations of (I).