Synthesis and Crystal Structure of the Bis(ethoxo)tetrathio-μ-disulfido-diphosphate Salt: [pyH]2[P2S6(OEt)2].

The new dithiophosphate anion P₂S₆(OEt)₂^2- was obtained from the reaction of commercially available P₄S₁₀ with Na₂S in pyridine, subsequent ethanolysis and isolated as the stable bis(pyridinium) salt 1. The molecular structure of 1 in the crystal was determined by single-crystal X-ray diffraction and reveals a PSSP dihedral angle of 87.3(1)° within the anion. The compound is a rare representative of a thiodiphosphate anion with a disulfide bridge between the two phosphorus atoms. [ABSTRACT FROM AUTHOR]