| Othernames | Cerium di-cyclooctatraene |
|---|---|
| Iupacname | Bis(η8-cyclooctatetraene)cerium |
Cerocene is a organometallic complex with the chemical formula Ce(C8H8)2 (Ce(cot)2).[1][2] It is a sandwich compound consisting of a central cerium atom and two cyclooctatetraenide rings.
Preparation
Cerocene can be prepared by reducing cerium(III) di-cyclooctatraene anion salts:[1]
- Ce(C8H8)2K → Ce(C8H8)2 + K+
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
Although the cyclooctatetraenide ligand is usually considered a dianion and therefore cerocene is identified as a Ce(IV) complex, theoretical and experimental analysis of the compound indicates that is more correctly described containing a Ce(III) atom.[1]
Related compounds
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
- ^ 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. ISSN 0276-7333
- ^ 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