The synthesis and characterization of ferrocene (Fc) in 1951 has been widely marked as the birth of organometallic chemistry, sparking the rich chemistry of metallocenes. Besides many prosperous applications ranging from medicinal chemistry, battery design, atomic sensors to catalysis , a defining feature of metallocenes is their unmatched redox chemistry, with the one electron oxidation of ferrocene to ferrocenium serving as standard reference for nonaqueous electrochemical processes. Considering that transition metal metallocenes usually traverse between formal +II and +III oxidation states, corresponding to the neutral metallocene [MCp2] (M = metal, Cy = cyclopentadienyl) and cationic metallocenium [MCp2] + , the further expansion of these boundaries has gained a lot of attention in recent years. The synthesis and characterization of the nickelocenium dication and decamethylferrocene dication mark recent advances in the oxidation of metallocenes to the formal +IV metal oxidation state.