Antimony oxide fluorides preparation

Antimony(Ill) fluoride may be prepared by treating antimony trioxide or trichloride with hydrofluoric acid. Pure SbF is then obtained by carefully evaporating all of the water from the cmde product, which is subsequently sublimed. SbF does not hydrolyze as readily as do the other antimony ttihahdes. When heated in open air at 100°C, a crystalline soHd quickly forms of composition Sb302(0H)2F3, which, upon further heating, is transformed into antimony oxide fluoride [11083-22-0] SbOF. This compound may also be prepared by heating 1 1 mixtures of Sb203 and SbF. There are three known crystalline modifications. 

Chloromethyl)tetrafluorophosphorane has been obtained thus far only by the above reaction. It may be noted that, although a redox reaction takes place between (chloro-methyl)dichlorophosphine and antimony (III) fluoride, (chloromethyl)difluorophosphine is the only product formed. The reaction of dichlorophosphines with anti-mony(V) fluoride was the first method of preparation of tetrafluorophosphoranes to be reported. The strongly oxidizing antimony(V) fluoride, however, seems to be required only in special instances, such as the one described below. 

The heavier phosphorus trihaUdes (PX3, X = Cl, Br, I) are prepared by direct halogenation. The trifluoride, on the other hand, is best synthesized by treating the trichloride with an ionic fluoride such as CaF2 or ZnF2- The arsenic, antimony, and bismuth trifluorides are prepared by adding hydrogen fluoride to the oxides. (If fluorine gas is used, the pentafluorides result.) The other trihalides of arsenic and antimony can be produced by direct halogenation of either the elements or the trioxides, while the bismuth trihalides are best produced by the action of aqueous hydrohalic acids on 61203. 

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