Lanthanum(III) sulfide is a binary inorganic chemical compound of lanthanum metal and sulfur with the chemical formula La2S3.[2][3][4]
| Names | |
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| IUPAC name
lanthanum(3+);trisulfide
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| Other names
Dilanthanum trisulfide, lanthanum sesquisulfide
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.031.580 |
| EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| La2S3 | |
| Molar mass | 373.99 g·mol−1 |
| Appearance | reddish-yellow crystals |
| Density | 4.9 g/cm3[1] |
| Melting point | 2,100 °C (3,810 °F; 2,370 K) |
| reacts with hot water | |
| Hazards | |
| GHS labelling: | |
 
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| Structure | |
| cubic | |
| Related compounds | |
Other cations
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Cerium(III) sulfide, Promethium(III) sulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
editLanthanum(III) sulfide can be prepared from the effect of sulfur vapor on metallic lanthanum:
- 2 La + 3 S → La2S3
It can also be prepared from the effect of hydrogen sulfide on lanthanum:
- 2 La + 3H2S → La2S3 + 3 H2
The effect of hydrogen sulfide on lanthanum oxide in the presence of reducing agents also produces lanthanum(III) sulfide:
- La2O3 + 3 H2S + 3 C → La2S3 + 3 CO2 + 3 H2
Physical properties
editDilanthanum trisulfide forms reddish-yellow crystals of the cubic system, with space group I43d, and unit cell parameters a = 0.8706 nm.[5]
It does not dissolve in cold water.
Chemical properties
edit- Reacts with hot water:
- La2S3 + 6 H2O → 2 La(OH)3 + 3 HS
- Reacts with acids:
- La2S3 + 3 HCl → 2 LaCl3 + 3 H2S
- Oxidized by oxygen in atmosphere:
- 2 La2S3 + 9 O2 → 2 La2O3 + 6 SO2
Uses
editLa2S3 is used as a precursor to prepare complex compounds. It is also used in glass manufacturing and in optical fibers.[6]
References
edit- ^ "Lanthanum Sulfide". American Elements. Retrieved 27 July 2024.
- ^ "Lanthanum (III) Sulfide (La2S3) Powder (CAS 12031-49-1)". samaterials.com. Retrieved 27 July 2024.
- ^ "Lanthanum(III) sulfide | CAS 12031-49-1 | SCBT - Santa Cruz Biotechnology". scbt.com. Retrieved 27 July 2024.
- ^ Bouroushian, Mirtat (23 April 2010). Electrochemistry of Metal Chalcogenides. Springer Science & Business Media. p. 32. ISBN 978-3-642-03967-6. Retrieved 27 July 2024.
- ^ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3548. ISBN 978-0-412-30120-9. Retrieved 27 July 2024.
- ^ "Lanthanum(III) sulfide, 99% (REO), Thermo Scientific Chemicals | Fisher Scientific". Fisher Scientific. Retrieved 27 July 2024.