Bi-nuclear neutral sulfur– nitrosyl iron complex [Fe2(SR)2(NO)4]has been obtained by replacement of thiosulfate ligands in dianion [Fe2(S2O3)2(NO)4] 2- by 1-methyl-imidazole-2-yl. From X-ray analysis data, the complex has centrosymmetrical dimeric structure,with the iron atoms being linked via N–C–S bridge. From Mossbauer spectroscopy,isomeric shift is 0.180(1)mm/s and quadrupole splitting is 0.928(2)mm/s at T =290K. By comparative studying the mass-spectra in the gaseous phase of solid samples decomposition and kinetics of NO release in 1%aqueous solutions of dimethylsulfoxide,using of the ligand with CH3 substituent in position 1 of imidazole-2-thiol was shown to yield a more stable donor of nitrogen monoxide than earlier obtained analog with imidazole-2-thiol, [Fe2(C3H3N2S)2(NO)4].
Inorganica Chimica Acta 359(2006)570–576