Bis[bis(triphenylphosphoranylidene)-ammonium] mu-tetrathiaoxalato-bis[(2-thioxo-1,3-dithiole-4,5-dithiolato)nickelate(II)]

The binuclear complex anion in [(C6H5)(6)P2N](2)[(C3S5)Ni(C2S4)Ni(C3S5)], c onventionally abbreviated (PPN)(2)[(dmit)Ni(tto)Ni(dmit)], where PPN is bis (triphenylphosphoranylidene)ammonium, dmit is 2-thioxo-1,3-dithiole-4,5-dit hiolate and tto is tetrathiaoxalate, is centrosymmetric and essentially pla nar, except for a small twist of 2.7(1)degrees at the Ni centers. The bond lengths [average Ni-S distance 2.166(8) Angstrom] and angles are comparable to those reported elsewhere for other salts of the component ions. The cry stal packing and the charge state of the complex anion are not favorable fo r electrical conduction. The binuclear complex anion was synthesized by a s impler method than that published previously.