Pyridinium tribromidostannate(II)
Year: 2026
Type: article
Abstract: Single crystals of the title compound, (C 5 H 6 N)[SnBr 3 ] or [PyH][SnBr 3 ], were grown from aqueous solutions of pyridinium bromide, [PyH]Br, and tin dibromide, SnBr 2 . The compound crystallizes in the monoclinic space group P 2 1 / n with two formula units in the asymmetric unit. The cations have bond lengths and angles similar to those found in other pyridinium salts. In its first coordination sphere, the anions have a trigonal–pyramidal ( tpy ) shape with the Sn II atoms at the apex and the three bromine atoms at the base. The tin–bromine bond lengths are all greater than 2.5 Å, and the bond angles are all less than 92°, which indicates the presence of tetrel bonds. These occur along the twofold screw axis and extend the coordination sphere of the tin atoms to highly distorted, 3 3 -aaa octahedra. In the crystal, the two pyridinium cations are aggregated via weak π–π interactions into centrosymmetric dimers, which form angles of 61.4 (4)° between them. Additional N—H...Br hydrogen bonds between cations and anions are bifurcated and weak.
Source: IUCrData
Authors: Felix Henkel, Hans Reuter
Institution: Osnabrück University
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $300
OpenAlex ID: W7216210891