[Bis(1,3-dithiole-2-thione-4,5-dithiolato)diarylantimonate(1-)], [Ar2Sb(dmit)2](-), complexes. Crystal structures of [NEt4][Ar2Sb(dmit)(2)] (Ar=Ph or p-tolyl)

The ionic complexes [Q][Ph2Sb(dmit)(2)] (4; Q = NEt4 or 1,4-Me-2-pyridinium) and [Net(4)][(p-tolyl)(2)Sb(dmit)(2)] (5) have been prepared from [Q](2)[Zn(dmit)(2)] and Ar2SbCl3 in the presence of KSCN (H-2-dmit = 4,5-dimercapto-1,3-dithiole-2-thione). As shown by X-ray crystallography for 4 (Q = NEt4) and 5, these complexes contain distorted octahedral anions with cis-aryl groups : the C-Sb-C angles in 4 (Q = NEt4) and 5 are 93.1(2) and 95.3(5)degrees, respectively. The dmit chelates are unsymmetrically bonded to antimony in both 4 (Q = NEt4) and 5 with the longer bonds trans to the aryl groups (for both compounds, the Sb-S bond lengths are in the ranges, 2.614 to 2.636 and 2.530-2.550 Angstrom). (C) 1997 Elsevier Science Ltd.