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Phosphorus Trifluorodibromide, PF3Br2

Phosphorus Trifluorodibromide, PF3Br2, was first produced by passing bromine into phosphorus trifluoride cooled by a freezing mixture. It is a pale brown fuming liquid which freezes to a yellow solid at -20° C. and decomposes at ordinary temperatures in a similar manner to the dichloride:—

5PF3Br2 = 3PF5 + 2PBr5

On complete hydrolysis it gives H3PO4, HF and HBr.

The corresponding diiodide, PF3I2, is probably formed when the trifluoride is absorbed by iodine. It is a yellowish-red solid.

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