3-[(Diphenylphosphinothioyl)oxy]-N-methylpropan-1-aminium diphenylphosphanylthioate

The title salt, C16H21NOPS+center dot C12H10OPS, was synthesized from the reaction between 3-(methylamino)propan-1-ol and PPh2(S) Cl in the presence of Et3N. Its structure has been identified using spectroscopic methods and X-ray analysis. Single crystals were obtained from ethanol by slow evaporation. In the asymmetric unit, a cation-anion pair is formed through an intermolecular N-H center dot center dot center dot O [N center dot center dot center dot O = 2.6974 (18) angstrom] hydrogen bond. The molecules are packed through N-H center dot center dot center dot O and N-H center dot center dot center dot S hydrogen bonds in the crystal and these hydrogen bonds are responsible for the high melting point. The P atoms of the anion and cation both have distorted tetrahedral environments.