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Lanthanum(III) sulfide

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Lanthanum(III) sulfide
Names
IUPAC name
lanthanum(3+);trisulfide
Other names
Dilanthanum trisulfide, lanthanum sesquisulfide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.580 Edit this at Wikidata
EC Number
  • 235-592-1
  • InChI=1S/2La.3S/q2*+3;3*-2
    Key: YTYSNXOWNOTGMY-UHFFFAOYSA-N
  • [S-2].[S-2].[S-2].[La+3].[La+3]
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:
GHS07: Exclamation markGHS02: Flammable
Structure
cubic
Related compounds
Other cations
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).

Lanthanum(III) sulfide is a binary inorganic chemical compound of lanthanum metal and sulfur with the chemical formula La2S3.[2][3][4]

Synthesis

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Lanthanum(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

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Dilanthanum 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

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  • 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 athmosphere:
2 La2S3 + 9 O2 → 2 La2O3 + 6 SO2

Uses

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La2S3 is used as a precursor to prepare complex compounds. It is also used in glass manufacturing and in optical fibers.[6]

References

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  1. ^ "Lanthanum Sulfide". American Elements. Retrieved 27 July 2024.
  2. ^ "Lanthanum (III) Sulfide (La2S3) Powder (CAS 12031-49-1)". samaterials.com. Retrieved 27 July 2024.
  3. ^ "Lanthanum(III) sulfide | CAS 12031-49-1 | SCBT - Santa Cruz Biotechnology". scbt.com. Retrieved 27 July 2024.
  4. ^ 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.
  5. ^ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3548. ISBN 978-0-412-30120-9. Retrieved 27 July 2024.
  6. ^ "Lanthanum(III) sulfide, 99% (REO), Thermo Scientific Chemicals | Fisher Scientific". Fisher Scientific. Retrieved 27 July 2024.