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- W2334835275 abstract "Nitrosylation of high-spin [Fe(κ2-O2NO)4]2– (1) yields {Fe(NO)}7 mononitrosyl iron complex (MNIC) [(κ2-O2NO)(κ1-ONO2)3Fe(NO)]2– (2) displaying an S = 3/2 axial electron paramagnetic resonance (EPR) spectrum (g⊥ = 3.988 and g∥ = 2.000). The thermally unstable nitrate-containing {Fe(NO)2}9 dinitrosyl iron complex (DNIC) [(κ1-ONO2)2Fe(NO)2]– (3) was exclusively obtained from reaction of HNO3 and [(OAc)2Fe(NO)2]– and was characterized by IR, UV–vis, EPR, superconducting quantum interference device (SQUID), X-ray absorption spectroscopy (XAS), and single-crystal X-ray diffraction (XRD). In contrast to {Fe(NO)2}9 DNIC [(ONO)2Fe(NO)2]– constructed by two monodentate O-bound nitrito ligands, the weak interaction between Fe(1) and the distal oxygens O(5)/O(7) of nitrato-coordinated ligands (Fe(1)···O(5) and Fe(1)···O(7) distances of 2.582(2) and 2.583(2) Å, respectively) may play important roles in stabilizing DNIC 3. Transformation of nitrate-containing DNIC 3 into N-bound nitro {Fe(NO)}6 [(NO)(κ1-NO2)Fe(S2CNEt2)2] (7) triggered by bis(diethylthiocarbamoyl) disulfide ((S2CNEt2)2) implicates that nitrate-to-nitrite conversion may occur via the intramolecular association of the coordinated nitrate and the adjacent polarized NO-coordinate ligand (nitrosonium) of the proposed {Fe(NO)2}7 intermediate [(NO)2(κ1-ONO2)Fe(S2CNEt2)2] (A) yielding {Fe(NO)}7 [(NO)Fe(S2CNEt2)2] (6) along with the release of N2O4 (·NO2) and the subsequent binding of ·NO2 to complex 6. The N-bound nitro {Fe(NO)}6 complex 7 undergoes Me2S-promoted O-atom transfer facilitated by imidazole to give {Fe(NO)}7 complex 6 accompanied by release of nitric oxide. This result demonstrates that nitrate-containing DNIC 3 acts as an active center to modulate nitrate-to-nitrite-to-nitric oxide conversion." @default.
- W2334835275 created "2016-06-24" @default.
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- W2334835275 date "2012-12-13" @default.
- W2334835275 modified "2023-10-11" @default.
- W2334835275 title "Nitrate-to-Nitrite-to-Nitric Oxide Conversion Modulated by Nitrate-Containing {Fe(NO)<sub>2</sub>}<sup>9</sup> Dinitrosyl Iron Complex (DNIC)" @default.
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- W2334835275 doi "https://doi.org/10.1021/ic3023437" @default.
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