Promethocene

Promethocene
Names
	Other names Promethium cyclopentadienide
Identifiers
CAS Number	112341-23-8 ;
3D model (JSmol)	Interactive image;
	SMILES c1ccc[cH-]1.c2ccc[cH-]2.c3ccc[cH-]3.[Pm+3];
Properties
Chemical formula	Pm(C5H5)3
Molar mass	340.285
Appearance	yellow-orange solid
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). Infobox references

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 6s^0.115d^1.194f^2.21.^[2]

Preparation

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

Promethocene decomposes when exposed to water to produce promethium(III) hydroxide and cyclopentadiene.

References

^ ^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. P_260~261. 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.

[wj-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] 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.

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