Cyclooctatetraenide anion

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The cyclooctatetraenide dianion is an aromatic organic anion with the structure C8H82-. It is planar and aromatic, like the cyclopentadienide anion, and, like cyclopentadienide, easily forms compounds with metals.

Compounds[edit]

The salt potassium cyclooctatetraenide is easily formed by the reaction of cyclooctatetraene with potassium metal. It has the structure K2C8H8, or K2(COT).

Cyclooctatetraenic acid is a hypothetical acid with the structure H2C8H8, or H2(COT).

Uranocene, a sandwich compound containing two COT2− rings.

Several sandwich compounds involving the cyclooctatetraenide anion are known, the most notable of which are the actinocenes, such as uranocene, U(C8H8)2 or U(COT)2, thorocene, Th(C8H8)2 or Th(COT)2, and plutonocene, Pu(C8H8)2; ferricene (not to be confused with ferrocene), Fe(C8H8)2, is also known. Since the actinides can also exist in the (III) oxidation state, they can also exist in the form (where A is any actinide) AC5H5C8H8, or A(Cp)(COT), as the cyclopentadienide-cyclooctatetraenide. An example of this is UC5H5C8H8, or uranium cyclopentadienide-cyclooctatetraenide.