Promethium(III) sulfide

Promethium(III) sulfide
Names
	Other names Dipromethium trisulfide
Identifiers
CAS Number	12337-21-2;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/2Pm.3S/q2+3;3-2 Key: DWKHKOHUCVHMOJ-UHFFFAOYSA-N;
	SMILES [Pm+3].[Pm+3].[S-2].[S-2].[S-2];
Properties
Chemical formula	Pm2S3
Molar mass	386 g·mol−1
Appearance	garnet red crystals
Density	g/cm3
Structure
Crystal structure	orthorhombic
Related compounds
Related compounds	Lanthanum(III) sulfide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Promethium(III) sulfide is a binary inorganic compound with the chemical formula Pm₂S₃.

Synthesis

Promethium(III) sulfide can be produced by treating metallic promethium with sulfur:

2Pm + 3S → Pm₂S₃

Once prepared, promethium(III) sulfide can be purified by chemical vapor transport using iodine.^[1]

Promethium(III) sulfide can also be prepared by treating the sulfate with hydrogen sulfide at elevated temperatures:^[2]

Pm₂(SO₄)₃ + 12 H₂S → Pm₂S₃ + 12 H₂O + 12 S

The compound forms garnet red crystals of the orthorhombic system, space group I43d^[3] and exists in α and β forms.^[4]

^ A. W. Sleight and D. P. Kelly (1973), Aaron Wold and John K. Ruff (ed.), Rare-earth Sesquisulfides, Ln₂S₃, Inorganic Syntheses, vol. 14, McGraw-Hill Book Company, Inc., pp. 152–155
^ K. Wetzel (1963). "Lanthanum Sulfides". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2. NY, NY: Academic Press. p. 1153.
^ Vassiliev, Valery P.; Lysenko, Valery A.; Gaune-Escard, Marcelle (1 June 2019). "Relationship of thermodynamic data with Periodic Law". Pure and Applied Chemistry. 91 (6): 879–893. doi:10.1515/pac-2018-0717. ISSN 1365-3075.
^ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3779. ISBN 978-0-412-30120-9. Retrieved 27 July 2024.