Tris(cyclopentadienyl)cerium

Last updated
Tris(cyclopentadienyl)cerium
Ce(C5H5)3.png
Names
Other names
Cerium cyclopentadienide
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • 215-073-6
PubChem CID
  • InChI=1S/3C5H5.Ce/c3*1-2-4-5-3-1;/h3*1-5H;/q3*-1;+3 Yes check.svgY
    Key: KDGBXTFCUISDFL-UHFFFAOYSA-N Yes check.svgY
  • c1ccc[cH-]1.c2ccc[cH-]2.c3ccc[cH-]3.[Ce+3]
Properties
Ce(C5H5)3
Molar mass 335.401
Appearanceorange-red solid [1]
Melting point 435 °C (Decomposes slightly when melted)
Boiling point 230 °C
(10−3~10−4mmHg, sublimates)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tris(cyclopentadienyl)cerium is a metal organic compound of cerium with the chemical formula Ce(C5H5)3. It and the other cyclopentadiene compounds of the lanthanide metals are different from the cyclopentadienyl complexes of general transition metals and is considered to be ionically bonded. [1]

Contents

Preparation


Tris(cyclopentadienyl)cerium can be obtained by reacting anhydrous cerium chloride and sodium cyclopentadienide in a tetrahydrofuran medium: [1]

3C5H5Na + CeCl3 → (C5H5)3Ce+ 3 NaCl

Chemical properties

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

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. 1 2 3 《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. P260~261. 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. PMID   28913523 . Retrieved 2019-12-19.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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