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Masked Low-Coordinate Fe(-I) Species: NHC- and Alkene-Supported Fe(-I)-Dinitrogen Complexes
Yujian Wang1, Peng Wang1, Xuebing Leng1
1State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China.
Researchers stabilized elusive iron(-I) complexes using N-heterocyclic carbene (NHC) and divinyltetramethyldisiloxane (dvtms) ligands. These novel iron complexes demonstrate potential as catalysts for challenging chemical transformations like reductive dinitrogen activation and hydrodehalogenation.
Area of Science:
- Organometallic Chemistry
- Inorganic Chemistry
- Catalysis
Background:
- Iron(-I) oxidation state is poorly understood due to limited stable complexes.
- Low-coordinate iron species are crucial for mediating redox transformations.
Purpose of the Study:
- To synthesize and characterize novel, stable iron(-I) complexes.
- To investigate the reactivity of these iron(-I) complexes in chemical transformations.
Main Methods:
- Synthesis of iron(-I) complexes using N-heterocyclic carbene (NHC) and divinyltetramethyldisiloxane (dvtms) ligands.
- Characterization via NMR, magnetic susceptibility, EPR, elemental analysis, and X-ray diffraction.
- Reactivity studies involving dinitrogen, alkenes, and organic halides.
Main Results:
- Successfully synthesized and characterized a series of stable iron(-I) complexes: [K(18-C-6)(THF)n][(NHC)Fe(N2)(η:2η2-dvtms)].
- Demonstrated the conversion of iron(-I) complexes to iron(I) and iron(0) species.
- Showcased the capability of iron(-I) complexes in mediating two-electron reductive transformations and hydrodehalogenation.
Conclusions:
- The NHC and dvtms ligand combination effectively stabilizes iron(-I) species.
- These iron(-I) complexes act as masked low-coordinate iron(-I) species.
- The synthesized complexes show significant potential as reagents and catalysts for challenging chemical reactions.
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