Tetrakis(cyclopentadienyl)uranium(IV)

Tetrakis(cyclopentadienyl)uranium(IV), U(C5H5)4, abbreviated U(Cp)4, is an organouranium compound composed of a uranium atom sandwiched between four cyclopentadienide rings.

Tetrakis(cyclopentadienyl)­uranium(IV)
Names
IUPAC name
Tetrakis(η5-cyclopentadienyl)uranium(IV)
Other names
Tetracyclopentadienyluranium
U(Cp)4
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/4C5H5.U/c4*1-2-4-5-3-1;/h4*1-5H;/q4*-1;+4
    Key: OQDGQBKHUMGQKF-UHFFFAOYSA-N
  • [CH-]1C=CC=C1.[CH-]1C=CC=C1.[CH-]1C=CC=C1.[CH-]1C=CC=C1.[U+4]
Properties
C20H20U
Appearance red crystals
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Synthesis and properties

Tetrakis(cyclopentadienyl)uranium(IV) was first prepared in 1962 by Ernst Otto Fischer, who reacted uranium tetrachloride with excess potassium cyclopentadienide in benzene and obtained the complex as red crystals at 6% yield:[1][2]

UCl4 + 4 KCp → U(Cp)4 + 4 KCl

Solid crystals of U(Cp)4 are air-stable, but the benzene solution is extremely air-sensitive.

Reduction of U(Cp)4 with uranium metal yields tris(cyclopentadienyl)uranium(III), U(Cp)3.[1]

References
  1. Seyferth, Dietmar (2004-07-01). "Uranocene. The First Member of a New Class of Organometallic Derivatives of the f Elements". Organometallics. 23 (15): 3562–3583. doi:10.1021/om0400705. ISSN 0276-7333.
  2. Fischer, Ernst Otto; Hristidu, Yani (1962-04-01). "Notizen: Über Aromatenkomplexe von Metallen LVII. Uran-tetracyclopentadienyl". Zeitschrift für Naturforschung B. 17 (4): 275–276. doi:10.1515/znb-1962-0410. ISSN 1865-7117. S2CID 105017911.
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