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Tin 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.
SnF4 can be prepared by the reaction of tin metal with fluorine gas:
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:
With alkali metal fluorides hexafluorostannates are produced , which contain the octahedral SnF6 anion. SnF4 behaves as a Lewis acid and adducts L2·SnF4 and L·SnF4 have been produced.
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