Cyclopentadienyl

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Cyclopentadienyl
Cyclopentadienyl-Anion.svg
Cyclopentadienyl anion
Identifiers
CAS number 2143-53-5
PubChem 137443
ChemSpider 121110 YesY
ChEBI CHEBI:36769
Beilstein Reference 2070324
Gmelin Reference 323080
Jmol-3D images Image 1
Image 2
Properties
Molecular formula C5H5
Molar mass 65.09 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

In chemistry, cyclopentadienyl is commonly used for an anionic cyclic group of atoms with the formula C5H5. Cyclopentadienyl is closely related to cyclopentadiene, from which it can be formed by deprotonation. Cyclopentadienyl has five carbon atoms bonded together in a pentagonal planar ring, all five of which are bonded to individual hydrogen atoms. Cyclopentadienyl anion is chemically aromatic and shows equal bond lengths between carbon atoms in the ring.

Cyclopentadienyl is known in organometallic chemistry where it forms cyclopentadienyl complexes.

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