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Cerocene is a organometallic complex with the chemical formula Ce(C8H8)2 (Ce(cot)2). It is a sandwich compound consisting of a central cerium atom and two cyclooctatetraenide rings.
It undergoes a disproportionation, leading to an equilibrium between cerocene and a double-decker structure containing two cerium atoms:
Although the cyclooctatetraenide ligand is usually considered a dianion and therefore cerocene is identified as a Ce(IV) complex, theoretical and experimental analysis of the compound indicates that is more correctly described containing a Ce(III) atom.
Cerocene is commonly confused with the compound tris(cyclopentadienyl)cerium.
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