Nitrogenase Model Compounds: [μ-N2H2{Fe(“NHS4”)}2], the Prototype for the Coordination of Diazene to Iron Sulfur Centers and Its Stabilization through Strong N[BOND]H ⃛ S Hydrogen Bonds

Authors

  • Prof. Dr. Dieter Sellmann,

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    1. Institut für Anorganische Chemie der Universitat Erlangen-Nürnberg, Egerlandstrasse 1, D-8520 Erlangen (FRG)
    • Institut für Anorganische Chemie der Universitat Erlangen-Nürnberg Egerlandstrasse 1, D-8520 Erlangen (FRG)
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  • Dipl.-Chem. Wolfgang Soglowek,

    1. Institut für Anorganische Chemie der Universitat Erlangen-Nürnberg, Egerlandstrasse 1, D-8520 Erlangen (FRG)
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  • Dr. Falk Knoch,

    1. Institut für Anorganische Chemie der Universitat Erlangen-Nürnberg, Egerlandstrasse 1, D-8520 Erlangen (FRG)
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  • Dr. Matthias Moll

    1. Institut für Anorganische Chemie der Universitat Erlangen-Nürnberg, Egerlandstrasse 1, D-8520 Erlangen (FRG)
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  • Transition Metal Complexes with Sulfur Ligands, Part 48. This work was supported by the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie.–Part 47: D. Sellmann and I. berth, Inorg. Chim. Acta 164 (1989) 171.–“NHS4”-H2 = 2,2′-bis(2-mercaptophenylthioldiethylamine).

Abstract

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How are the energetically extremely unfavorable intermediates in nitrogenase reduction of N2 stabilized? By complexation, steric hindrance, and strong hydrogen bonding! At least this is the answer suggested by the complex 1. Diazene (HN [DOUBLE BOND] NH) is stabilized in 1 by bonding to Fe centers that are completely surrounded by biologically relevant donor atoms. Thus, 1 is a model complex for enzymatic nitrogen fixation in both a functional and a structural sense.

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