Abstract
Three trinuclear complex anions, [(FeCl 2) 2MS 4] 2− (M = Mo, W) and [(MoS 4) 2Fe] 3−, were studied by Mössbauer and magnetic measurements. The results imply a high electron affinity of the MS 2− 4 group and intramolecular spin coupling. These properties and structural features suggest these molecular groups as possible building blocks of the Fe-Mo co-factor of the nitrogen fixing enzyme nitrogenase.
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