Samarium(III) chloride

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Samarium(III) chloride
Samarium(III)_chloride_hexahydrate
Names
IUPAC name
samarium(III) chloride
Other names
samarium trichloride
trichlorosamarium
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.030.712 Edit this at Wikidata
EC Number
  • 233-797-0
UNII
  • InChI=1S/3ClH.Sm/h3*1H;/q;;;+3/p-3 checkY
    Key: BHXBZLPMVFUQBQ-UHFFFAOYSA-K checkY
  • InChI=1/3ClH.Sm/h3*1H;/q;;;+3/p-3
    Key: BHXBZLPMVFUQBQ-DFZHHIFOAZ
  • Cl[Sm](Cl)Cl
Properties
SmCl3
Molar mass 256.76 g/mol (anhydrous)
364.80 g/mol (hexahydrate)
Appearance pale yellow solid (anhydrous)

cream-coloured solid (hexahydrate)

Density 4.46 g/cm3 (anhydrous)

2.383 g/cm3 (hexahydrate)

Melting point 682 °C (1,260 °F; 955 K)
Boiling point decomposes
92.4
mL (10 °C
)
Structure
hexagonal, hP8
P63/m, No. 176
Tricapped trigonal prismatic
(nine-coordinate)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Irritant
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319
P264, P280, P302+P352, P305+P351+P338, P321, P332+P313, P337+P313, P362
Related compounds
Other anions
 Samarium(III) fluoride
Samarium(III) bromide
Samarium(III) oxide
Other cations
 Samarium(II) chloride
Promethium(III) chloride
Europium(III) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Samarium(III) chloride, also known as samarium trichloride, is an inorganic compound of samarium and chloride. It is a pale yellow salt that rapidly absorbs water to form a hexahydrate, SmCl3.6H2O.[1] The compound has few practical applications but is used in laboratories for research on new compounds of samarium.

Structure

Like several related chlorides of the lanthanides and actinides, SmCl3 crystallises in the UCl3 motif. The Sm3+ centres are nine-coordinate, occupying trigonal prismatic sites with additional chloride ligands occupying the three square faces.

Preparation and reactions

SmCl3 is prepared by the "

samarium oxide:[2]

10 NH4Cl + Sm2O3 → 2 (NH4)2[SmCl5] + 6 NH3 + 3 H2O

The pentachloride is then heated to 350-400 °C resulting in evolution of ammonium chloride and leaving a residue of the anhydrous trichloride:

(NH4)2[SmCl5] → 2 NH4Cl + SmCl3

It can also be prepared from samarium metal and hydrochloric acid.[3][4]

2 Sm + 6 HCl → 2 SmCl3 + 3 H2

Aqueous solutions of samarium(III) chloride can be prepared by dissolving metallic samarium or samarium carbonate in hydrochloric acid.

Samarium(III) chloride is a moderately strong

samarium trifluoride
:

SmCl3 + 3 KF → SmF3 + 3 KCl

Uses

Samarium(III) chloride is used for the preparation of samarium metal, which has a variety of uses, notably in magnets. Anhydrous SmCl3 is mixed with sodium chloride or calcium chloride to give a low melting point eutectic mixture. Electrolysis of this molten salt solution gives the free metal.[5]

In laboratory

Samarium(III) chloride can also be used as a starting point for the preparation of other

organometallic compounds of samarium, such as bis(pentamethylcyclopentadienyl)alkylsamarium(III) complexes.[6]

References

  1. ^ F. T. Edelmann, P. Poremba (1997). W. A. Herrmann (ed.). Synthetic Methods of Organometallic and Inorganic Chemistry. Vol. 6. Stuttgart: Georg Thieme Verlag.
  2. ISBN 978-0-470-13256-2
    .
  3. doi:10.1021/ja01472a010
    .
  4. ^ J. D. Corbett (1973). "Reduced Halides of the Rare Earth Elements". Rev. Chim. Minérale. 10: 239.
  5. ISBN 978-0-08-022057-4
    .
  6. ISBN 3-540-64526-8
    .
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