Tin_tetrafluoride
Tin(IV) fluoride
Chemical compound
Tin(IV) fluoride is a chemical compound of tin and fluorine with the chemical formula SnF4 and is a white solid with a melting point above 700 °C.[1]
SnF4 can be prepared by the reaction of tin metal with fluorine gas:[2]
- Sn + 2F2 → SnF4
However, a passivating metal fluoride layer will be created and the surface will eventually become unreactive. An alternative synthesis is the reaction of SnCl4 with anhydrous hydrogen fluoride:[1]
- SnCl4 + 4HF → SnF4 + 4HCl
With alkali metal fluorides (e.g. KF) hexafluorostannates are produced (e.g.K2SnF6), which contain the octahedral SnF62− anion. SnF4 behaves as a Lewis acid and adducts L2·SnF4 and L·SnF4 have been produced.[2]