Dinitrogen Coordination to a High-Spin Diiron(I/II) Species.

Dinitrogen Coordination to a High-Spin Diiron(I/II) Species.
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DOI:
10.1002/anie.202202329
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发表时间:
2022-05-23
影响因子:
16.6
通讯作者:
Murray, Leslie J.
Murray, Leslie J.
中科院分区:
化学1区
文献类型:
--
作者:
Torres, Juan F.;Oi, Collin H.;Moseley, Ian P.;El-Sakkout, Nabila;Knight, Brian J.;Shearer, Jason;Garcia-Serres, Ricardo;Zadrozny, Joseph M.;Murray, Leslie J.

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Dinitrogen coordination to iron centers underpins industrial and biological fixation in the Haber-Bosch process and by the FeM cofactors in the nitrogenase enzymes. The latter employ local high spin metal centers; however, iron-dinitrogen coordination chemistry remains dominated by low valent states, contrasting the enzyme systems. Here, we report a high-spin mixed-valent cis-(μ-1,2-dinitrogen)diiron(I/II) complex [(FeBr)2(μ-N2)Lbis]– (2) where [Lbis]– is a bis(β-diketiminate) cyclophane. Field-applied Mössbauer spectra, dc and ac magnetic susceptibility measurements, and computational methods support a delocalized S=7/2 Fe2N2 unit with D=–5.23 cm−1 and consequent slow magnetic relaxation. Dinitrogen coordination to multiiron complexes is instrumental in understanding the reactivity of nitrogenases cofactors. We report the synthesis of a high-spin mixed-valent cis-(μ-1,2-dinitrogen)diiron(I/II) complex obtained by a one-electron reduction of a diiron(II/II) precursor. The electronic structure of the complex was studied using Mössbauer spectroscopy, SQUID magnetometry, and DFT calculations, which support a S = 7/2 ground state.
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