A Molecular Low-Coordinate [Fe-S-Fe] Unit in Three Oxidation States |
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Authors: | Christian Schneider Dr Serhiy Demeshko Prof?Dr Franc Meyer Dr C Gunnar Werncke |
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Institution: | 1. Fachbereich Chemie, Philipps-Universität, Hans-Meerwein-Str. 4, 35043 Marburg, Germany;2. Institut für Anorganische Chemie, Universität Göttingen, Tammannstr. 4, 37077 Göttingen, Germany |
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Abstract: | A Fe-S-Fe] subunit with a single sulfide bridging two low-coordinate iron ions is the supposed active site of the iron-molybdenum co-factor (FeMoco) of nitrogenase. Here we report a dinuclear monosulfido bridged diiron(II) complex with a similar complex geometry that can be oxidized stepwise to diiron(II/III) and diiron(III/III) complexes while retaining the Fe-S-Fe] core. The series of complexes has been characterized crystallographically, and electronic structures have been studied using, inter alia, 57Fe Mössbauer spectroscopy and SQUID magnetometry. Further, cleavage of the Fe-S-Fe] unit by CS2 is presented. |
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Keywords: | 57Fe Mössbauer spectroscopy electrochemistry iron sulfide complex magnetism nitrogenase |
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