Sodium tetrafluoroborate

Sodium tetrafluoroborate
Other names sodium fluoroborate, NaBF4
Identifiers
CAS number	13755-29-8
Properties
Molecular formula	NaBF4
Molar mass	109.79
Melting point	384 °C
Related compounds
Other cations	Nitrosonium tetrafluoroborate
Y tetrafluoroborate (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Sodium tetrafluoroborate, also called sodium borofluoride, is a compound with formula NaBF₄. It forms colorless water-soluble rhombic crystals and is soluble in water (108 g/100 ml) and less soluble in organic solvents.^[1]

It is a source of tetrafluoroborate anion. It is used in organic chemistry for fluorination reactions and as a catalyst, and for lab-scale preparation of boron trifluoride.

Sodium tetrafluoroborate is used in some fluxes used for brazing.

Sodium tetrafluoroborate can be prepared by neutralizing tetrafluoroboric acid with sodium carbonate or sodium hydroxide. ^[2]

Na₂O + 2 HBF₄ → 2 NaBF₄ + H₂O

NaOH + HBF₄ → NaBF₄ + H₂O

Na₂CO₃ + 2 HBF₄ → 2 NaBF₄ + H₂O + CO₂

Sodium tetrafluoroborate can be used to prepare nitrosonium tetrafluoroborate, an explosive, by reacting with nitrogen(III) oxide.^[3]

On heating, sodium tetrafluoroborate decomposes to sodium fluoride and boron trifluoride.^[4]

Sodium tetrafluoroborate can be used for synthesis of ionic liquids, where the tetrafluoroborate often plays the role of the product's anion.

References

1. ^ Template:Kirjaviite
2. ^ Template:Kirjaviite
3. ^ http://books.google.fi/books?id=J55D3HcgPuoC&pg=PA76&dq=%22Sodium+tetrafluoroborate%22&hl=fi&ei=TNCoTZbDIov3sgbc5aWXCA&sa=X&oi=book_result&ct=result&resnum=5&ved=0CEcQ6AEwBA
4. ^ http://books.google.fi/books?id=LkIWiNg4FGEC&pg=PA1271&dq=%22Sodium+tetrafluoroborate%22&hl=fi&ei=TNCoTZbDIov3sgbc5aWXCA&sa=X&oi=book_result&ct=result&resnum=6&ved=0CEwQ6AEwBQ