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Tetrakis(cyclopentadienyl)uranium(IV)

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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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.

Synthesis and properties

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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

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  1. ^ a b 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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