Scheme 1.

Synthesis of complex 1 from FeCl2 and [PNP][SSNO]. Solid state structure of [Fe(NO)2(S5)]− in 1. Ellipsoids are shown at 50% probability levels. Blue, red, orange, and yellow ellipsoids represent N, O, Fe, and S atoms, respectively. The [PNP]+ cation is omitted for clarity.