Bis[bis(triphenylphosphoranylidene)-ammonium] μ-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)], conventionally abbreviated (PPN)(2)[(dmit)Ni(tto)Ni(dmit)], where PPN is bis(triphenylphosphoranylidene)ammonium, dmit is 2-thioxo-1,3-dithiole-4,5-dithiolate and tto is tetrathiaoxalate, is centrosymmetric and essentially planar, 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 crystal packing and the charge state of the complex anion are not favorable for electrical conduction. The binuclear complex anion was synthesized by a simpler method than that published previously.