The title salt, C16H21NOPS(+) · 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...O [N...O = 2.6974 (18) Å] hydrogen bond. The molecules are packed through N-H...O and N-H...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.
Keywords: 3-[(diphenylphosphinothioyl)oxy]-N-methylpropan-1-aminium; crystal structure; diphenylphosphanylthioate; high melting point; hydrogen bonding; spectroscopic analysis.