Polysulfanes are binary compounds of sulfur and hydrogen together in the form of H2Sn where n>1 (n=1 or H2S is called sulfane and is excluded from polysulfanes; also some chemists exclude disulfane or hydrogen disulfide, HS2H, from the class polysulfanes). Polysulfanes have unbranched chains of sulfur atoms which end with one hydrogen atom on either side. Polysulfanes from H2S2 to H2S8 (from n=2 to n=8) have been obtained in the pure form but heavier ones have been obtained as mixtures with variable n. Polysulfanes have stability issues because of their easy disproportionation to sulfane (hydrogen sulfide) and sulfur.




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