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Article Dans Une Revue Angewandte Chemie International Edition Année : 2022

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

Résumé

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-(mu-1,2-dinitrogen)diiron(I/II) complex [(FeBr)(2)(mu-N-2)L-bis](-) (2), where [L-bis](-) is a bis(beta-diketiminate) cyclophane. Field-applied Mossbauer 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.
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hal-03645288 , version 1 (13-10-2023)

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Juan F. Torres, Collin H. Oi, Ian P. Moseley, Nabila El-Sakkout, Brian J. Knight, et al.. Dinitrogen Coordination to a High-Spin Diiron(I/II) Species. Angewandte Chemie International Edition, 2022, 61 (22), pp.e202202329. ⟨10.1002/anie.202202329⟩. ⟨hal-03645288⟩
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