Preparation of tetramethylammonium azidosulfite and tetramethylammonium cyanate sulfur dioxide-adduct, [(CH3)(4)N](+)[SO2]N-3](-), [(CH3)(4)N](+)[SO2OCN](-) and crystal structure of [(CH3)(4)N](+)[SO2N3](-) [German]

摘要

Tetramethylammonium azide forms with sulfur dioxide an azidosulfite salt. It is characterized by NMR and vibrational spectroscopy and the crystal structure analysis. [(CH3)(4)N](+)[SO2N3](-) crystallizes in the monoclinic space, group P2(1)/c with a = 551.3(1) pm, b = 1095.2(1) pm, c = 1465.0(1) pm, beta = 100.63(1)degrees, and four formula units in the unit cell. The crystal structure possesses a strong S-N interaction between the N3- anions and the SO2 molecules. The S-N distance of 200.5(2) pm is longer than a covalent single S-N bond. The structure is compared with ab initio calculated data. Furthermore an adduct of tetrametylammonium cyanate and sulfur dioxide is reported. It is characterised by NMR and vibrational spectroscopy. The structure is calculated by ab initio methods. [References: 52]