Cerocene

Cerocene is a metal organic compound of cerium with the chemical formula Ce(C₅H₅)₃. It is the most unstable of the lanthanocenes in dry air. It, and the other lanthanocenes, is different from cyclopentadiene complexes of general transition metals and is considered to be ionically bonded.^[1]

Cerocene

Names
Other names Cerium cyclopentadienide
Identifiers
CAS Number	1298-53-9 Y
3D model (JSmol)	Interactive image
ChemSpider	92235 N
EC Number	215-073-6
PubChem CID	16052392
InChI InChI=1S/3C5H5.Ce/c3*1-2-4-5-3-1;/h3*1-5H;/q3*-1;+3 Y Key: KDGBXTFCUISDFL-UHFFFAOYSA-N Y
SMILES c1ccc[cH-]1.c2ccc[cH-]2.c3ccc[cH-]3.[Ce+3]
Properties
Chemical formula	Ce(C5H5)3
Molar mass	335.401
Appearance	orange-red solid[1]
Melting point	435 °C (Decomposes slightly when melted)
Boiling point	230 °C (10-3~10-4mmHg, sublimates)
Related compounds
Related compounds	Cyclopentadiene
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Cerocene can be obtained by reacting anhydrous cerium chloride and sodium cyclopentadienide in a tetrahydrofuran medium:^[1]

3C₅H₅Na + CeCl₃ → (C₅H₅)₃Ce+ 3 NaCl

Chemical properties

Cerocene decomposes when exposed to water to produce cerium(III) hydroxide and cyclopentadiene.

Related compounds

There are literature reports on the synthesis^[2] and properties^[3] of the tetravalent cerium compound Ce(C₅H₅)₄, but it has been pointed out that the synthesis method is not credible.^[4][5]

References

1. 《无机化学丛书》. 第七卷 钪 稀土元素. 易宪武 等主编. 科学出版社. 2.3.7 稀土元素有机化合物. P_260~261. 1.π络合物
2. B.L. Kalsotra, S.P. Anand, R.K. Multani, B.D. Jain (Apr 1971). "Tetracyclopentadienyl and tetraindenyl compounds of cerium(IV)". Journal of Organometallic Chemistry. 28 (1): 87–89. doi:10.1016/S0022-328X(00)81578-8. Archived from the original on 2018-06-29. Retrieved 2019-12-19.{{cite journal}}: CS1 maint: multiple names: authors list (link)
3. 任镜清, 徐光宪. 四茂铈(Ce(C₅H₅)₄)的电子结构和化学键[J]. 科学通报, 1985(19):23-28.
4. G.B. Deacon, T.D. Tuong, D.G. Vince (Jan 1983). "Refutation of the synthesis of tetrakis(cyclopentadienyl)cerium(IV)". Polyhedron. 2 (9): 969–970. doi:10.1016/S0277-5387(00)81419-9. Archived from the original on 2018-06-01. Retrieved 2019-12-19.{{cite journal}}: CS1 maint: multiple names: authors list (link)
5. Reiner Anwander, Michael Dolg, Frank T. Edelmann (2017). "The difficult search for organocerium( iv ) compounds". Chemical Society Reviews. 46 (22): 6697–6709. doi:10.1039/C7CS00147A. ISSN 0306-0012. Retrieved 2019-12-19.{{cite journal}}: CS1 maint: multiple names: authors list (link)