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Chemical elements
  Boron
    Isotopes
    Energy
    Production
    Application
    Physical properties
    Chemical properties
      Boron Hydrides
      Tetraborodecahydride
      Borobutane
      Hexaborododecahydride
      Borohexylene
      Boron trihydride
      Boro-ethane
      Decaborotetradecahydride
      Boron halogen
      Boron trifluoride
      Hydrofluoboric acid
      Potassium borofluoride
      Fluoboric acid
      Perfluoboric acid
      Boron subchloride
      Boron trichloride
      Boron tribromide
      Boron tri-iodide
      Oxides of Boron
      Tetraboron trioxide
      Boron dioxide
      Tetraboron pentoxide
      Borohydrates
      Hypoborates
      Boron sesqui-oxide
      Boron trioxide
      Boric anhydride
      Boric Acids
      Orthoboric acid
      Boric acid
      Boracic acid
      Complex Boric Acids
      Perboric Acid and Perborates
      Sodium perborate
      Sodium hyperborate
      Potassium perborate
      Rubidium perborate
      Ammonium perborate
      Barium perborate
      Boron sesquisulphide
      Boron trisulphide
      Boron pentasulphide
      Boron selenide
      Boron nitride
      Boron amide
      Boron imide
      Boron phosphide
      Boron phospho-iodides
      Boron carbide
      Boron thiocyanate
      Boron Alkyls
      Boron trimethyl
      Boron Silicides and
      Boroethane

Boron tribromide, BBr₃

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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.
-50	0.7	-20	5.5	10	32	40	130	70	390
-40	1.5	-10	10 5	20	54	50	193	80	540
-30	3	0	19	30	85	60	280	90	730

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.

Boron tribromide, BBr3

Boron tribromide, BBr₃