Halogens, elemental arsenic halides

Halides of the type AX6, where A is P, As, Sb, or Bi, and X is F, Cl, Br, or I, may generally be obtained by interaction of the elements. It is also possible to react AX3-type compounds with the corresponding halogen, and this is particularly useful when X = F. The halides SbF6 and BiF6 are made in this way. The compounds SbBr6 (cf. Section II,A,2), Sbl6, and arsenic(V) and bismuth(V) halides other than the fluorides are unknown. 

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