Classes of Sandwich Compounds
The best known members are the metallocenes of the formula M(C5H5)2 where M = Cr, Fe, Co, Ni, Pb, Zr, Ru, Rh, Sm, Ti, V, Mo, W, Zn. These species are also called bis(cyclopentadienyl)metal complexes. Other arenes can serve as ligands as well.
- Mixed cyclopentadienyl complexes: M(C5H5)(CnHn). some examples are Ti(C5H5)(C7H7) and (C60)Fe(C5H5Ph5) where the fullerene ligand is acting as a cyclopentadienyl analaogue.
- Bis(benzene) complexes: M(C6H6)2, the best known example being Bis(benzene)chromium.
- Bis(cyclooctatetraenyl) complexes: M(C8H8)2, such as U(C8H8)2 and Th(C8H8)2.
- Bis(cyclobutadienyl) complexes: M(C4H4)2, such as Fe(C4H4)2.
Sandwich complexes are even known containing purely inorganic ligands, such as Fe(C5Me5)(P5) and 2-.
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