Molecular complexes of octafluoronaphthalene with acyclic and heterocyclic sulfur–nitrogen compounds
作者:Irina Yu. Bagryanskaya、Yuri V. Gatilov、Enno Lork、Rüdiger Mews、Makhmut M. Shakirov、Paul G. Watson、Andrey V. Zibarev
DOI:10.1016/s0022-1139(02)00127-6
日期:2002.8
Mismatched molecular 1:1 complexes were prepared from C10F8 and sulfur diimides ArNSNAr 1 and ArNSN–SiMe32, 3 (1, 2: Ar=2,6–dimethylphenyl; 3: Ar=phenyl). In the case of 2, the complexation is accompanied by the unexpected cyclization of 2 into 7-methyl-2,1-benzisothiazole 4. The X-ray molecular structures of C10F8·1, C10F8·3 and C10F8 are presented; in C10F8·4 the 7-methyl-2,1-benzisothiazole
Air-sensitive, thermally unstable tris(dimethylamino)sulfonium (TAS) salts (3) of the title anions [ArNSN](-) have been prepared from corresponding sulfurdiimides Ar-N=S=N-SiMe3 (2) by Si-N bond cleavage with [(Me2N)(3)S](+)[Me3SiF2](-)(TASF). They are characterized by low-temperature X-ray crystallography as Z isomers. Because of the very short terminal S-NI distance (144.2 (3h) - 147.9 (3i) pm) and the relatively long internal S-N distance (158.3 (3i) - 160.3 (3c) pm) the [ArNSN](-) ions should be regarded as thiazylamides 1b, rare species containing a SN triple bond. A bonding model is developed and the experimental results are compared with those of restricted Hartree-Fock (R drop HF), density functional theory (DFT), and Moller-Plesset second-order (MP2) calculations.