[Fe 2 {SeC 6 H 2 ‐2,4,6‐Ph 3 } 2 {N(SiMe 3 ) 2 } 2 ] and [Fe 2 {SeC 6 H 2 ‐2,4,6‐Ph 3 } 4 ], the First Three‐Coordinate Selenolatoiron Complexes

In a controlled manner , half or all the bis(trimethylsilyl)amido ligands of 1 can be replaced by selenolato ligands, resulting in the first selenolatoiron complexes 2 and 3 with three‐coordinate iron centers. They are stabilized by secondary metal–framework bonds (here metal–carbon) and could, since they are coordinatively unsaturated, possibly serve as model compounds of the FeMo cofactor of nitrogenases.