Synthesis of polyantimony ligand complexes starting from Cp* 4 Sb 4 .

The reactivity of Cp* 4 Sb 4 (1) towards ionic compounds and transition metal complexes with labile ligands was investigated in order to synthesize polyantimony ligand complexes. The silver salts [Ag][X] and the metalate Na[Cp*Mo(CO) 3 ] were primarily used, leading in the raction with Cp* 4 Sb 4 to the formation of [Cp* 2 Sb][X] (X = TEF (2a), FAL (2b)), [(Cp*Mo(CO) 3 ) 3 (μ 3 -Sb 3 )] (3) and [Cp*Mo(CO) 2 (η 3 -Sb 3 )] (4), respectively. The reaction of 1 with the transition metal complexes [(Cp'''M) 2 (tol)] leads to a degradation of the original Sb 4 unit and to the formation of [(Cp'''M) 4 (μ 3 -Sb) 4 ] (M = Ni (5); Co (6)). Towards [Cp R Fe(CO) 2 ] 2 , substitutions on the antimony atoms were observed to give [{Cp R Fe(CO) 2 } 4 (μ 4 -Sb 4 )] (Cp R = Cp'' (7a), Cp''' (7b)). All complexes were characterized by XRD and spectroscopic methods.