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Nitrogenase enzymes catalyze the reduction of atmospheric dinitrogen to ammonia utilizing a Mo‐7Fe‐9S‐C active site, the so‐called FeMoco cluster. FeMoco and an analogous small‐molecule (Et4N)[(Tp)MoFe3S4Cl3] cubane have both been proposed to contain unusual spin‐coupled MoIII sites with an S(Mo)=1/2 non‐Hund configuration at the Mo atom. Herein, we present Fe and Mo L3‐edge X‐ray magnetic circular...
Der FeMo‐Cofaktor des Nitrogenase‐Enzyms und der eines elektronisch verwandten Modellkomplexes wurden durch Fe‐L2,3‐Kanten‐ und Mo‐L3‐Kanten‐XMCD‐Spektroskopie untersucht. In ihrer Zuschrift auf S. 9473 diskutieren S. DeBeer et al. ihre experimentellen Befunde, die erstmals eine spingekoppelte Nicht‐Hund‐Konfiguration am Mo‐Atom unterstützen.
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