Cyclopentadienyl can refer to Cyclopentadienyl anion, or cyclopentadienide, [C5H5]− Cyclopentadienyl ligand Cyclopentadienyl radical, [C5H5]• Cyclopentadienyl cation, [C5H5]+ See also Pentadienyl This set index article lists chemical compounds articles associated with the same name.If an internal link led you here, you may wish to change the link to point directly to the intended article. Wikiwand - on Seamless Wikipedia browsing. On steroids.