[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)

Article abstract of DOI:10.1016/S0277-5387(97)00004-1

The ionic complexes [Q][Ph₂Sb(dmit)₂] (4; Q = NEt₄ or 1,4-Me₂-pyridinium) and [Net₄][(p-tolyl)₂Sb(dmit)₂] (5) have been prepared from [Q]₂[Zn(dmit)₂] and Ar₂SbCl₃ in the presence of KSCN (H₂-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)°, 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 A).