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Angew Chem Int Ed Engl ; 61(22): e202202329, 2022 05 23.
Artículo en Inglés | MEDLINE | ID: mdl-35302701

RESUMEN

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(ß-diketiminate) cyclophane. Field-applied Mössbauer spectra, dc and ac magnetic susceptibility measurements, and computational methods support a delocalized S=7 /2 Fe2 N2 unit with D=-5.23 cm-1 and consequent slow magnetic relaxation.


Asunto(s)
Hierro , Nitrogenasa
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