Chemical elements
    Physical properties
    Chemical properties
      Boron Hydrides
      Boron trihydride
      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
      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

Boron phospho-iodides

The compound BPI2 is prepared by acting upon boron tri-iodide with phosphorus in carbon disulphide solution, and, in a carbon dioxide atmosphere, washing away the iodide of phosphorus simultaneously produced with a further quantity of carbon disulphide. It is a dark red solid which melts in vacuo at 190° to 200° and sublimes at higher temperatures. Chlorine, oxygen, and many metals attack it vigorously, and water immediately decomposes it, among the products being hydriodic, phosphorous, and boric acids. When heated to 160° in hydrogen it is reduced to the compound BPI, which sublimes in vacuo, forming orange-yellow crystals, and closely resembles the other phospho-iodide in properties.

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