Lithium hexafluorosilicate
Names
IUPAC name
dilithium; hexafluorosilicon(2-)
Other names
Dilithium hexafluorosilicate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.037.595 Edit this at Wikidata
EC Number
  • 241-372-6
  • InChI=1S/F6Si.2Li/c1-7(2,3,4,5)6;;/q-2;2*+1
    Key: QSDQCOGGZWIADS-UHFFFAOYSA-N
  • [Li+].[Li+].F[Si-2](F)(F)(F)(F)F
Properties
F6Li2Si
Molar mass 155.96 g·mol−1
Appearance White powder
Density 2.33 g/cm3
soluble
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H302
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Lithium hexafluorosilicate is an inorganic chemical compound with the chemical formula Li2SiF6.[1][2]

Synthesis

Lithium hexafluorosilicate can be obtained by reacting hexafluorosilicic acid with lithium hydroxide or lithium carbonate or by reacting silicon tetrafluoride with lithium fluoride.[3]

H2[SiF6] + 2LiOH → Li2[SiF6] + 2H2O

Physical properties

Lithium hexafluorosilicate is a white, odorless solid that is soluble in water and methanol. When heated above 250 °C, it decomposes into lithium fluoride and silicon(IV) fluoride. It has a trigonal crystal structure with the space group P 321 (space group no. 150) and three formula units per unit cell, isotypic to sodium hexafluorosilicate.[4][5]

Uses

Lithium hexafluorosilicate is used as an intermediate in the manufacture of pharmaceuticals and other chemical compounds. It is also an intermediate in the preparation of lithium chloride from lithium-containing minerals by reacting with hexafluorosilicic acid.[citation needed]

References

  1. ^ "Lithium Hexafluorosilicate". American Elements. American Elements. Retrieved 17 June 2024.
  2. ^ "Lithium hexafluorosilicate (CAS 17347-95-4)". Santa Cruz Biotechnology. Retrieved 17 June 2024.
  3. ^ Macintyre, Jane E. (15 July 1993). Dictionary of Inorganic Compounds, Supplement 1. CRC Press. p. 303. ISBN 978-0-412-49090-3. Retrieved 17 June 2024.
  4. ^ Hinteregger; Wurst; Niederwieser; Heymann; Huppertz (1 March 2014). "Pressure-supported crystal growth and single-crystal structure determination of LiSiF". Zeitschrift für Kristallographie – Crystalline Materials. 229 (2): 77–82. doi:10.1515/zkri-2013-1622. ISSN 2196-7105. Retrieved 17 June 2024.
  5. ^ Haynes, William M. (9 June 2015). CRC Handbook of Chemistry and Physics, 96th Edition. CRC Press. p. 4-72. ISBN 978-1-4822-6097-7. Retrieved 17 June 2024.
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