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Significance The biosynthesis and mechanism of action of nitrogenase, an enzyme that converts dinitrogen to ammonia under ambient conditions, are problems of prominent significance in metallobiochemistry. Because the active centers of the enzyme are metal–ligand clusters, it is feasible that they are attainable by synthesis and as such are primary goals in the field of biomimetic inorganic chemistry. Here we present a ligand metathesis strategy utilizing the periodic near-identity of molybdenum and tungsten when incorporated into analogous compounds. The approach provides a pathway for constructing heterometal heteroleptic Fe–S clusters of presumed relevance to the active site. Based on cubane-type stereochemistry, clusters have been prepared allowing alterations in structure and ligand binding, and inclusion of a light core atom.

Ligand metathesis as rational strategy for the synthesis of cubane-type heteroleptic iron–sulfur clusters relevant to the FeMo cofactor