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Top: Superposition of the [Fe4NS3] core of the mono-core-heteroligated cluster [Fe4(NBut)S3Cl4]2− (47; solid blue, with three terminal chloride ligands also shown) and the corresponding [Fe4S3X] subunit of FeMo-co (dashed red). Bottom: Reactions of 47 illustrating core retention under terminal ligand substitution, oxidation and reduction, and replacement of the core imide by transamination with an arylamine to afford 54.
