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cyclopentadienyl complex
A cyclopentadienyl complex is a metal complex with one or more cyclopentadienyl groups (C5H5−, abbreviated as Cp−). Based on the type of bonding between the metals and the cyclopentadienyl moieties, cyclopentadienyl complexes are classified into the following three categories: a) π-complexes, b) σ-complexes, and c) ionic complexes.
==Cyclopentadienyl ligand==
The alkali-metal cyclopentadienyl complexes react with various transition metal compounds to form a variety of complexes that are found throughout chemistry. The Cp ligand typically coordinates metals through the donation of π-electrons. This is typically drawn as dashed bonds to the metal center through all five carbon atoms. Examples include ferrocene, (); the Fp dimer, ()2; chromocene, (); cobaltocene, (); and nickelocene, (). When the Cp rings are mutually parallel the compound is known as a sandwich complex. This area of organometallic chemistry was first discovered in 1954 with the determination of the structure of ferrocene 〔RH Crabtree, 2001, ''The Organometallic Chemistry of the Transition Metals," 3rd Edn., New York: John Wiley & Sons.〕 Some metallocenes, notably rhodocene, (), and nickelocene, do exist in some forms where the metal-to-ring binding does not include all five ring atoms. Other metals form bent complexes, e.g., zirconocene dichloride, (), a catalyst for ethylene polymerization. Compounds featuring only one Cp ring are known as half-sandwich compounds or as piano stool compounds.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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