in neat (no solvent) cracking of S4N4 vapour over heated silver wool at 300 °C under vac. (J. D. Woollins, Polyhedron, 1987,6 ,939); liq.-nitrogen trap;

under N2, at -196°C / 1E-5 mbar slow warming to 80°C, 8h; pptn. by warming to room temp.; elem. anal.;