Room-Temperature Synthesis of [BMIm][Sn 5 O 2 Cl 7 ] with ∞ 1 (Sn 2 OCl 2 ) Strands in a Saline [BMIm][SnCl 3 ] Matrix.

The novel tin(II) oxychloride [BMIm][Sn 5 O 2 Cl 7 ] (BMIm = 1-butyl-3-methylimidazolium) is obtained by the room-temperature reaction (25 °C) of black SnO and SnCl 2 in [BMIm]Cl/SnCl 2 as an ionic liquid. The title compound can be described as composed of noncharged, infinite ∞ 1 (Sn 2 OCl 2 ) strands that are embedded in a saline matrix of [BMIm] + and [SnCl 3 ] - . The ∞ 1 (Sn 2 OCl 2 ) strands consist of a backbone of edge-sharing OSn 4/2 tetrahedra, which represent one-dimensional (1D) strands cut out of the layer-type structure of SnO. In [BMIm][Sn 5 O 2 Cl 7 ], the ∞ 1 (Sn 2 OCl 2 ) strands, which mimic a 1D semiconductor, are terminated by chlorine atoms, whereas they are interconnected by oxygen atoms in the 2D semiconductor SnO. The view of the noncharged ∞ 1 (Sn 2 OCl 2 ) strands in a saline [BMIm][SnCl 3 ] matrix is validated by dissolution experiments. Thus, electron microscopy and Raman spectroscopy show a deconstruction of [BMIm][Sn 5 O 2 Cl 7 ] single crystals after treatment with chloroform with a dissolution of [BMIm][SnCl 3 ], the formation of SnCl 2 needles, and tin oxide as a solid remain.