Promethocene

Names
Other names Promethium cyclopentadienide
Identifiers
CAS Number	112341-23-8 Y
3D model (JSmol)	Interactive image
InChI InChI=1S/3C5H5.Pm/c3*1-2-4-5-3-1;/h3*1-5H;/q3*-1;+3 N Key: SKRISUXFUFKQSA-UHFFFAOYSA-N N
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[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). 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