In chemistry, the cyclooctatetraenide anion or cyclooctatetraenide is an aromatic species with a formula of [C8H8]2− and abbreviated as COT2−. Its name derives from the molecule cyclooctatetraene. Salts of the cyclooctatetraenide anion can be stable, e.g., Dipotassium cyclooctatetraenide or Disodium cyclooctatetraenide. more complex coordination compounds are known as cyclooctatetraenide complexes, such as actinocene
The structure shown is a composite of resonance contributors in which each carbon carries part of the negative charge.