Amine‐Bis(ethene)nickel(o) Complexes; Structure of 1‐Azabicyclo[2.2.2]octanebis(ethene)nickel(o)

The formation of complexes from “soft” Lewis acids and “hard” bases is disfavored according to the HSAB concept. Surprisingly, however, tris(ethene)nickel(0) and amines afford crystalline complexes of the type [(amine)Ni(C2H4)2] as well as a binuclear complex, [(1,4-diazabicyclo[2.2.2]octane)Ni2(C2H4)4]. The title compound 1 is highly symmetric.