Cerocene
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| Names | |
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| Other names
Cerium cyclopentadienide
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| EC Number |
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PubChem CID
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| Properties | |
| 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
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Cyclopentadiene |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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]
Preparation
[edit]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
[edit]Cerocene decomposes when exposed to water to produce cerium(III) hydroxide and cyclopentadiene.
Related compounds
[edit]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
[edit]- ^ a b c 《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
- ^ 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) - ^ 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.
- ^ 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) - ^ 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)
| Cerium(II) | |||
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| Cerium(III) |
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| Cerium(III,IV) |
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| Cerium(IV) | |||
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