In the context of organometallic chemistry and EAN calculations, how many electrons does a fully coo — Coordination Compounds Chemistry Question

💡 Solution & Explanation

A cyclopentadienyl anion ($C_5H_5^-$) contains an aromatic 6- $\pi$ electron system. When it binds to a metal atom in an $\eta^5$ fashion (binding through all five carbon atoms simultaneously), it donates all 6 of its $\pi$ -electrons to the metal. Therefore, it is treated as a 6-electron donor in EAN formalisms.