 Unit cell of tin(IV) fluoride | |
| Names | |
|---|---|
| IUPAC name tin(IV) fluoride | |
| Other names stannic fluoride, tin tetrafluoride | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.029.105 |
| EC Number |
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| UNII | |
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| Properties | |
| SnF4 | |
| Molar mass | 194.704 g/mol |
| Appearance | white solid |
| Density | 4.78 g / cm3 |
| Melting point | above 700 °C (sublimes) |
| Structure | |
| Tetragonal,tI10 | |
| I4/mmm, No. 139 | |
| Hazards | |
| GHS labelling: | |
  | |
| Danger | |
| H302,H312,H314,H332 | |
| P260,P261,P264,P270,P271,P280,P301+P317,P301+P330+P331,P302+P352,P302+P361+P354,P304+P340,P305+P354+P338,P316,P317,P321,P330,P362+P364,P363,P405,P501 | |
| Related compounds | |
Otheranions | Tin(IV) chloride Tin(IV) bromide Tin(IV) iodide |
Othercations | Carbon tetrafluoride Silicon tetrafluoride Germanium tetrafluoride Tin tetrafluoride Lead tetrafluoride |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Tin(IV) fluoride is achemical compound oftin andfluorine with thechemical formula SnF4. It is a white solid. As reflected by its melting point above 700 °C, the tetrafluoride differs significantly from the other tetrahalides of tin.[1]
SnF4 can be prepared by the reaction oftin(IV) chloride with anhydroushydrogen fluoride:[1]
When treated with alkali metal fluorides (e.g. KF), tin(IV) fluoride formshexafluorostannates:
In K2SnF6, tin adopts anoctahedral geometry.
Otherwise, SnF4 behaves as aLewis acid forming a variety of adducts with the formula L2·SnF4 and L·SnF4.[2]
Unlike the heavier tin tetrahalides, which contain tetrahedrally coordinated tin, tin(IV) fluoride contains octahedrally coordinated tin. The octahedra share four corners. There are two terminal, unshared, fluorine atomstrans to one another.[3] The melting point of SnF4 is much higher (700 °C) than the other tin(IV) halides: (SnCl4, −33.3 °C;SnBr4, 31 °C;SnI4, 144 °C).[1] The structure can also be contrasted with the tetrafluorides of the lighter members of group 14, (CF4,SiF4 andGeF4), all of which in the solid state form molecular crystals.[2]
