Fluoride crystal structures. Part VI. Difluorobromine(III) hexafluoroantimonate(V)

Abstract

Crystals of difluorobromine(III) hexafluoroantimonate(V) are orthorhombic, space group Pcca, a= 10·12, b= 5·81, c= 10·95 Å. The structure was refined by three dimensional least-squares methods, the final R being 0·097 for 567 independent reflections. The bromine atom has two nearest fluorine neighbours at 1·69 Å, giving the expected angular ion, and two other neighbours at 2·29 Å, completing a much distorted square plane around bromine. These two atoms are part of the distorted octahedral co-ordination of the antimony atom and form cis bridges between the heavy atoms to complete an endless chain arrangement.