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Tetrakis(cyclopentadienyl)uranium(IV)

Chemical compound From Wikipedia, the free encyclopedia

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.

Quick facts Names, Identifiers ...
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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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]

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