摘要
A neutral {Fe(NO) 2 } 9 dinitrosyliron complex (DNIC) [(SC 6 H 4 -o-NHCOPh)(Im)Fe(NO) 2 ]-(Im = imidazole; 2) was prepared by the reaction of [Fe(μ-SC 6 H 4 -o- NHCOPh)(NO) 2 ] 2 (1) and 2 equiv of imidazole. In the synthesis of the anionic {Fe(NO) 2 } 9 DNIC [(SC 6 H 4 -o-NHCOPh) 2 Fe(NO) 2 ] - (3), thiolate [SC 6 H 4 -o-NHCOPh] - triggers ligand substitution of DNIC 2 to yield DNIC 3. At 298 K, complexes 2 and 3 exhibit well-resolved nine- and five-line electron paramagnetic resonance (EPR) signals at g = 2.031 and 2.029, respectively, the characteristic g value of DNICs. The facile interconversions among the neutral {Fe(NO) 2 } 9 complex 2, the anionic {Fe(NO) 2 } 9 complex 3, and Roussin's red ester 1 were demonstrated. The EPR spectrum (the pattern of hyperfine splitting) in combination with the IR ν NO (the relative position of the ν NO stretching frequencies) spectrum may serve as an efficient tool for the discrimination of the anionic {Fe(NO) 2 } 9 DNICs, the neutral {Fe(NO) 2 } 9 DNICs, and Roussin's red ester. © 2006 American Chemical Society.