Synthesis and characterization of potential NO donors: novel iron–sulfur nitrosyls containing the μ-N–C–S skeleton

Binuclear paramagnetic nitrosyl iron complexes of “g∼2.03 family” were first synthesized. Their structure and properties differ from those of “the red Roussin salt ethers”. The novel nitrosyl iron complexes: [Fe2(μ2-SR)2(NO)4]·nH2O (η1-S, η1-N), n=1–2, R – 3-amino-1,2,4-triazolyl (1), 1,2,4-triazolyl (2), 1-methyl-tetrazolyl (3), benzothiazolyl (4) were obtained by the exchange reaction of Na2Fe2(S2O3)2(NO)4 with heterocyclic thiols and studied by methods of EPR, IR and Mössbauer spectroscopy. The molecular structure of complex 1 was determined by X-ray analysis.