Promethium(III) hydroxide

Promethium(III) hydroxide
Identifiers
CAS Number	13779-13-0 ;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/3H2O.Pm/h3*1H2;/q;;;+3/p-3 Key: HXMRPTXJQXYIQY-UHFFFAOYSA-K;
	SMILES [Pm+3].[OH-].[OH-].[OH-];
Properties
Chemical formula	Pm(OH)3
Appearance	purplish-pink solid
Density	5.1 g/cm3
Structure
Crystal structure	hexagonal
Lattice constant	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).
	Infobox references

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

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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[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.