Diorgano(1,3-dithiole-2-one-4,5-dithiolato)tin compounds, R2Sn(dmio) and [Q][R2Sn(dmio)X] [Q = onium cation; R = alkyl or aryl; X = halide or pseudohalide]: crystal structures of Me2Sn(dmio) and [NEt4][Ph2SnCl(dmio)]

Compounds, [Q][R2SnX(dmio)], [5: (a) Q = NEt4, R = Et, X = Br: R = Ph, X = Cl, (b) Q = NEt4, (c) Q = ferrocenyl-CH2NMe3], and [R2Sn(dmio)](n) [6: (a) R = Ph, (b) R = Me, (c) R = Et (d) R = Bu] (dmio = 1,3-dithiole-2-one-4,5-d ithiolate), have been prepared from [Q](2) [Zn(dmio)(2)] and R2SnX2; compou nds [5: Q = NEt4; R = Ph; (d) X = Br, (e) X = I, (f) X = NCS] have been obt ained by halide/pseudohalide exchange reactions from the chloride using NaX (X = Br, I or NCS). X-ray crystallography revealed that 6b is six-coordina te in the solid state, as a result of intermolecular Sn-O interactions [Sn- O-i = 2.654(6) Angstrom], which link the molecules into chains, and weak Sn -S interactions [Sn-S-ii = 3.649(3) Angstrom], which link the chains into l ayers. The anion in ionic 5b, as shown by X-ray crystallography, contains a distorted trigonal bipyramidal tin centre. (C) 1999 Elsevier Science S.A. All rights reserved.