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Lithium hexafluorosilicate

Lithium hexafluorosilicate

Names
IUPAC name dilithium; hexafluorosilicon(2-)
Other names Dilithium hexafluorosilicate
Identifiers
CAS Number	17347-95-4
3D model (JSmol)	Interactive image
ChemSpider	11254702
ECHA InfoCard	100.037.595
EC Number	241-372-6
PubChem CID	13629069
InChI InChI=1S/F6Si.2Li/c1-7(2,3,4,5)6;;/q-2;2*+1 Key: QSDQCOGGZWIADS-UHFFFAOYSA-N
SMILES [Li+].[Li+].F[Si-2](F)(F)(F)(F)F
Properties
Chemical formula	F6Li2Si
Molar mass	155.96 g·mol−1
Appearance	White powder
Density	2.33 g/cm3
Solubility in water	soluble
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chemical compound

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

Synthesis[edit]

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

H₂[SiF₆] + 2LiOH → Li₂[SiF₆] + 2H₂O

Physical properties[edit]

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[edit]

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[edit]