text: Multiple bismuth-containing clusters were reported, some of them synthesized through carbon monoxide ligand loss from the previously reported bismuth complexes. Strained cluster complexes with monodentate as well as bridging carbon monoxide units have also been isolated, such as [{Cp(μ-CO)Fe}(μ-Bi)] and [(µ-Bi)Co(CO)(µ-CO)].
  Spiro-like clusters such as  [{Ru(CO)}(µ-Bi){(µ-H)Ru(CO)} and cubane-like ones as [BiCo*] are representatives as well. The former displays a tetracoordinate bismuth metallic center along with a dicoordinated hydride ligand. The structure of the latter is cubic with the edges alternating bismuth and cobalt metallic centers.