Scheme 3.

a) Equilibria showing the formation of polysulfides and NO from SSNO− and SNO−. b) Proposed mechanism for the formation of complexes 1, 2, and 3 from SNO− and FeCl2.

a) Equilibria showing the formation of polysulfides and NO from SSNO− and SNO−. b) Proposed mechanism for the formation of complexes 1, 2, and 3 from SNO− and FeCl2.