The synthesis and structure of a five-coordinate Fe(II) complex, [(FeSN4)-S-II-N-Me2 (tren)](PF6) (1), which models the reactive properties of superoxide reductases (SORs), is reported. SORs catalyze the reduction of superoxide to peroxide in anaerobic organisms, thereby avoiding the O-2 formed in the more typical superoxide degradation enzyme superoxide dismutase (SOD). The thiolate ligand contained in model 1, as well as in SORs appears to play an important role in promoting SOR activity.