Electronic and Spatial Structures of Water-Soluble Dinitrosyl Iron Complexes with Thiol-Containing Ligands Underlying Their Ability to Act as Nitric Oxide and Nitrosonium Ion Donors

Figure 2

Spectra EPR of 2.03 complex from the solutions of DNIC with cysteine, containing ¹⁴NO (a) or ¹⁵NO (b), DNIC with mercaptotriazole (c), or DNIC with cysteine containing ⁵⁷Fe (d). Recordings were made at 77 K (left side) or at ambient temperature (right side). Right side: magnetic field scales are shown separately for EPR signal of DNIC with mercaptotriazole (c) and for EPR signals of DNIC with cysteine containing ¹⁴NO, ¹⁵NO, or ⁵⁷Fe (a, b, d).