One of the mysteries of the English language finally explained.
A planar cyclic anion, C₅H₅ −, derived from cyclopentadiene, which has aromatic character and forms complexes with metal atoms, most notably sandwich compounds in which a metal atom is bonded between two parallel cyclopentadienyl rings. Abbreviated Cp.
Early 20th century; earliest use found in Journal of the American Chemical Society. From cyclopentadiene + -yl.
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