Synthesis and characterization of tetraethylammonium and 1,4-dimethylpyridinium antimony(III) bis-dmit complexes

The antimony(III) bis-dmit (H2-dmit = 4,5-dimercapto-1,3-dithiole-2-thione) complexes (Y)Sb(dmit)2, where Y = Et4N (1) or Y = C7H10N (1,4-dimethylpyridinium) (2) are synthesized, and exhibit considerable metal-sulfur interanionic interaction in the solid state. In the complexes the anion Sb(dmit)2- constituting strong Sb-S bonds are ordered leading to pseudo trigonal bipyramidal antimony atoms. A polymeric two dimensional network is present in 1 but anionic dimers constitute the crystals of 2.