Promethium(III) hydroxide
Identifiers
3D model (JSmol)
  • InChI=1S/3H2O.Pm/h3*1H2;/q;;;+3/p-3
    Key: HXMRPTXJQXYIQY-UHFFFAOYSA-K
  • [Pm+3].[OH-].[OH-].[OH-]
Properties
Pm(OH)3
Appearance purplish-pink solid
Density 5.1 g/cm3
Structure
hexagonal
a = 6.39 Å, c = 3.68 Å
Related compounds
Other anions
 promethium oxide
Other cations
 neodymium(III) hydroxide
samarium(III) hydroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Promethium(III) hydroxide is an inorganic compound with a chemical formula Pm(OH)3. It is a radioactive compound.

Production

Promethium(III) hydroxide can be produced by reacting ammonia water with a solution of a promethium(III) salt, from which promethium(III) hydroxide precipitates as a purplish-pink amorphous solid. By heating with water, it can be forced to crystallize, giving hexagonal crystals isomorphous with other rare earth hydroxides:[1]

Pm3+ + 3OH− → Pm(OH)3↓

References

  1. ^ Weigel, Fritz; Scherer, Volker (1967). "Die Chemie Des Promethiums. VI. Kristallines Promethium(III)-hydroxid" [Chemistry of promethium. VI. Crystalline promethium(III) hydroxide]. Radiochimica Acta (in German). 7 (2–3): 72–74. doi:10.1524/ract.1967.7.23.72. S2CID 201841420.
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