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Boron tribromide, BBr3

Boron tribromide, BBr3, its preparation and purification may be carried out as described for the chloride.

Boron tribromide is a colourless, mobile liquid which boils at 90.5° C. and solidifies to a colourless mass which melts at -46° C. Its density is 2.6499 at 0° C. and 2.6175 at 16.5°. The vapour density is normal; the vapour pressure is as follows: -

°C.mm.°C.mm.°C.mm.°C.mm.°C.mm.
-500.7-205.510324013070390
-401.5-1010 520545019380540
-30301930856028090730


Boron tribromide reacts with ammonia at 0° to form boron imide.

2BBr3 + 27NH3 = B2(NH)3 + 6NH4Br.3NH3.

With phosphine, boron tribromide forms a white, solid substance of the formula BBr3.PH3.9 The corresponding arsenic compound BBr3.AsH3, prepared by the direct union of arsine and boron tribromide at - 100°, is a very unstable, white, amorphous solid, which, on keeping in the dark at 0°, slowly decomposes into boron tribromide, arsenic, and hydrogen. The following addition-compounds are also known: BBr3.PBr3, BBr3.PBr5, 2BBr3.PCl3, 2BBr3.PCl6, and 2BBr3.P2I4.

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