Promethocene
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3.png) | |
| Names | |
|---|---|
| Other names Promethium cyclopentadienide | |
| Identifiers | |
3D model (JSmol) | |
| |
| Properties | |
| Pm(C5H5)3 | |
| Molar mass | 340.285 |
| Appearance | yellow-orange solid[1] |
| Boiling point | 145~260 °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). | |
Promethocene is a metal-organic compound of promethium with the chemical formula Pm(C5H5)3. It is radioactive and stable in dry air. Promethocene is different from cyclopentadiene complexes of general transition metals and is considered to be ionically bonded.[1] Theoretical calculations show that its Pm natural population analysis (NPA) electronic configuration is 6s0.115d1.194f2.21.[2]
Preparation[edit]
Promethocene can be obtained by reacting anhydrous promethium(III) chloride and sodium cyclopentadienide in a tetrahydrofuran medium:[1]
- 3C5H5Na + PmCl3 → (C5H5)3Pm + 3 NaCl
Chemical properties[edit]
Promethocene decomposes when exposed to water to produce promethium(III) hydroxide and cyclopentadiene.
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
- ^ Krinsky, Jamin L.; Minasian, Stefan G.; Arnold, John (2010-12-08). "Covalent Lanthanide Chemistry Near the Limit of Weak Bonding: Observation of (CpSiMe3)3Ce−ECp* and a Comprehensive Density Functional Theory Analysis of Cp3Ln−ECp (E = Al, Ga)". Inorganic Chemistry. 50 (1). American Chemical Society (ACS): 345–357. doi:10.1021/ic102028d. ISSN 0020-1669.