Phosphorus heptabromide is an inorganic compound with the formula PBr₇. It is one of the

phosphorus Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Ear ...

bromide A bromide ion is the negatively charged form (Br−) of the element bromine, a member of the halogens group on the periodic table. Most bromides are colorless. Bromides have many practical roles, being found in anticonvulsants, flame-retardant ...

s. At normal conditions, it forms red

prism Prism usually refers to: * Prism (optics), a transparent optical component with flat surfaces that refract light * Prism (geometry), a kind of polyhedron Prism may also refer to: Science and mathematics * Prism (geology), a type of sedimentary ...

atic

crystal A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macro ...

s. PBr₇ can be prepared by the sublimation of a mixture of phosphorus pentabromide and

bromine Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest element in group 17 of the periodic table ( halogens) and is a volatile red-brown liquid at room temperature that evaporates readily to form a simi ...

.T. E. (Thomas Edward) Thorpe. A dictionary of applied chemistry (Volume 4)
/ref> :PBr₅ + Br₂ → PBr₇ The structure consists of a PBr₄⁺ cation paired with a

tribromide Tribromide is the anion with the chemical formula Br3−, or salts containing it: * Tetrabutylammonium tribromide * Tetrabromophosphonium tribromide * Pyridinium perbromide Sodium and potassium tribromides can be prepared by reacting NaBr or K ...

(Br₃^–) anion, and the tribromide is non-symmetric.

References

Phosphorus bromides Polyhalides Phosphonium compounds {{inorganic-compound-stub

See also

References