Cerocene

Last updated
Cerocene
Names
Other names
Cerium di-cyclooctatraene
Identifiers
3D model (JSmol)
  • Key: XMGBAYFIOLSVIM-YTBUGUEYSA-N
  • InChI=1S/2C8H6.Ce/c2*1-2-4-6-8-7-5-3-1;/h2*1-3,6-8H;/q2*-2;+4/b2*2-1-,3-1?,8-6?,8-7-;
  • C\1=C\[C-]=C/C=C\[C-]=C1.C\1=C\[C-]=C/C=C\[C-]=C1.[Ce+4]
Properties
Ce(C8H8)2
Molar mass 348.423
Appearancered crystal
Melting point 290 °C (With Decomposition)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Cerocene is a organometallic complex with the chemical formula Ce(C8H8)2. [1] [2] It is a sandwich compound containing a central cerium atom and two cyclooctatetraenide rings.

Contents

Preparation

Cerocene can be prepared by reducing cerium(III) di-cyclooctatraene anion salts.

Ce(C8H8)2K → Ce(C8H8)2 + K+ [1]

Chemical properties

Cerocene decomposes when exposed to water or oxygen to yield non-stoichiometric cerium-oxides and cyclooctratraene derivitives. [2]

It undergoes a disproportionation, leading to an equilibrium between cerocene and a double-decker structure containing two cerium atoms: [2]

2 Ce(C8H8)2⇌ Ce2(C8H8)3 + C8H8

Cerocene is a known precursor for uranocene, U(C8H8)2. [1]

Ce(C8H8)2 + UCl3⇌ U(C8H8)2 + CeCl3

Cerocene is commonly confused with the compound tris(cyclopentadienyl)cerium.

References

  1. 1 2 3 Streitwieser, Andrew; Kinsley, Steven A.; Jenson, Chris Henry; Rigsbee, John T. (2004-10-01). "Synthesis and Properties of Di-π-[8]annulenecerium(IV), Cerocene" . Organometallics. 23 (22): 5169–5175. doi:10.1021/om049743+. ISSN   0276-7333.
  2. 1 2 3 Walter, Marc D.; Booth, Corwin H.; Lukens, Wayne W.; Andersen, Richard A. (2009). "Cerocene Revisited: The Electronic Structure of and Interconversion Between Ce2(C8H8)3and Ce(C8H8)2". Organometallics. 28 (3): 698–707. doi:10.1021/om7012327. OSTI   948446.
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