The Reactivity of the Unbridged CoSn Bond in [(η5‐C5H5)(η2‐C2H4)CoSn{CH[Si(CH3)3]2}2]—The First Organometallic Complexes with direct CoSnChalcogen Bonding (Chalcogen = Se, Te)

Butterflylike frameworks are present in the isostructural clusters 1 and 2, in which the chalcogen atom is bound as a μ3 ligand to Co and Sn. These complexes are formed by Se/Te addition to the unbridged CoSn bond of 3 at room temperature. Compounds 1 and 2 are the first defined molecular complex compounds that contain the typical semiconductor combination Sn/E (E = Se, Te) and a ferromagnetic metal, and thus they could be of interest for applications in materials science.