Abstract Reactions of tetrasulphur tetranitride and triphenylphosphine in presence of Phosphine (I) or (II) have been studied. In case of p-tolyldiphenylphosphine(I), in addition to the trisulphurtrinitride derivatives (III&VI) and compound (V), mixed phosphine derivatives (VII to IX) are obtained. In case of morpholinodiphenylphosphine(II), the corresponding trisulphurtrinitride derivatives (III&X) and compound (V) are the only cyclic products isolated. New products have been characterized by physical, spectroscopic and analytical data. The two phosphines seem to exert different effects.