Cyclopentadienyl ligand
= Cyclopentadienyl ligand
{title2=$\mathrm{Cp^-}$}
The <cyclopentadienyl ligand> is based on $\mathrm{C_5H_5^-}$. In its common $\eta^5$ mode it binds through five ring carbons and donates six <electrons> in ionic <electron counting>. Ring substitution can create distinct NMR environments.