The main method for preparing these compounds is
thermolysis of mixtures of phosphorus and sulfur. The product distributions can be analyzed by
31P-NMR spectroscopy. More selective syntheses entail: • desulfurization, e.g. using
triphenylphosphine and, complementarily, • sulfidation using
triphenylarsine sulfide. ====== Phosphorus sesquisulfide is prepared by treating red phosphorus with sulfur above 450 K, followed by careful
recrystallization with
carbon disulfide and
benzene. An alternative method involves the controlled fusion of white phosphorus with sulfur in an inert, non-flammable solvent. ====== The α- and β- forms of can be prepared by treating the corresponding isomers of with : The respective product distribution is then analyzed by using 31P-NMR spectroscopy. In particular, α- can be easily made by the
photochemical reaction of with red phosphorus. ====== can be made by abstracting a sulfur atom from using
triphenylphosphine: ====== is most conveniently made by direct union of the corresponding elements, and is one of the most easily purified binary phosphorus sulfides. : ====== β- can be made by treating α- with in , which yields a mixture between α- and β-. : ==See also==