Cyclopentadienyl Ligands

Cyclopentadienyl Ligands (Cp-)

Electron Contribution: 6 electrons (anionic ligand).

Hapticity: η5 (pentahapto coordination).

Key Features:

  • Aromatic π-system that forms stable sandwich complexes.
  • Found in ferrocene ([Fe(Cp)2]) and other metallocenes.

Proposed Image: A side view of ferrocene in staggered conformation, with Cp ligands labeled as η5.