Citation: Fan Yiming, Cheng Jun, Gao Yafei, Shi Min, Deng Liang. Iron Dinitrogen Complexes Supported by Tris(NHC)borate Ligand: Synthesis, Characterization, and Reactivity Study[J]. Acta Chimica Sinica, ;2018, 76(6): 445-452. doi: 10.6023/A18030095 shu

Iron Dinitrogen Complexes Supported by Tris(NHC)borate Ligand: Synthesis, Characterization, and Reactivity Study

Fan Yiming ^a ,
Cheng Jun ^b ,
Gao Yafei ^b ,
Shi Min ^a,b,, ,
Deng Liang ^b,,

a.
School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237
b.
State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032

Corresponding author: Shi Min, mshi@mail.sioc.ac.cn Deng Liang, deng@sioc.ac.cn
Received Date: 10 March 2018
Available Online: 4 June 2018
Fund Project: the National Natural Science Foundation of China 21690062the National Key Research and Development Program 2016YFA0202900the National Natural Science Foundation of China 21725104the Strategic Priority Research Program of the Chinese Academy of Sciences XDB20000000the National Natural Science Foundation of China 21432001Project supported by the National Key Research and Development Program (No. 2016YFA0202900), the National Natural Science Foundation of China (Nos. 21725104, 21690062, 21432001), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB20000000) and the Fundamental Research Funds for the Central Universities (No. 222201717003)the Fundamental Research Funds for the Central Universities 222201717003

Figures(6)

The use of the N-adamantyl-substituted tris(NHC)borate ligand phenyltris(3-(1-adamantylimidazol-2-ylidene))borate (PhB(AdIm)₃^-) has enabled the preparation of the high-spin tetrahedral iron(I)-and iron(0)-N₂ complexes[PhB(AdIm)₃Fe(N₂)] (2) and[K(18-C-6)(THF)] [PhB(AdIm)₃Fe(N₂)] (4), from the reduction of the ferrous precursor[PhB(AdIm)₃FeCl] (1) and the iron(I) complex 2 with KC₈ under N₂, respectively. Single-crystal X-ray diffraction studies revealed a distorted tetrahedral coordination geometry for the iron centers in 2 and 4 with the terminally bonded N₂ ligand sitting in the cavity composed by the three adamantyl groups of the borate ligand. The frequencies of the N-N stretching resonance (1928 and 1807 cm^-1) of 2 and 4 are the lowest among the reported terminal N₂complexes of iron(I) and iron(0), respectively. ⁵⁷Fe Mössbauer spectrum (δ=0.59 mms^-1; ΔE_Q=1.31 mms^-1) and solution magnetic susceptibility measurement (μ_eff=5.2(1) μ_B) of 2 supported its high-spin iron(I) nature. The cyclic voltammogram of 2 measured in THF shows a quasi-reversible redox waves with E_1/2=-2.11 V (vs SCE), which is assignable to the corresponding redox process of[PhB(AdIm)₃Fe(N₂)]^1-/0. In addition, the reaction of 2 with an excess amount of CO led to the formation of the bis(carbonyl)iron(I) complex, [PhB(AdIm)₃Fe(CO)₂] (3), that was characterized by IR spectrum, solution magnetic susceptibility measurement, ¹H NMR, as well as elemental analysis. The protonation of 2 and 4 with HCl or HOTf at -78℃ only led to the formation of NH₂NH₂ and NH₃ in low yields[less than 9(3)% and 5(3)% (per mol Fe), respectively]. However, 1, 2, and 4 proved effective catalysts for the reductive silylation of N₂by KC₈ and Me₃SiCl to afford N(SiMe₃)₃ with comparable catalytic activity. The TON of these catalytic systems could reach 87 using 0.005 mmol of the catalyst, 2000 equiv. of KC₈, and 2000 equiv. of Me₃SiCl in 10 mL Et₂O at room temperature after 24 h.
- N-heterocyclic carbene,
- iron,
- dinitrogencomplex,
- N₂ activation,
- reductive silylation of N₂
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