Fluoride crystal structures. Part XV. Arsenic trifluoride–antimony pentafluoride

Abstract

Crystals of the adduct of arsenic trifluoride with antimony pentafluoride are monoclinic, space group P2₁/m, with Z= 2 in a unit cell of dimensions a= 6·92, b= 8·15, c= 5·51 Å, and β= 95·0°. The structure was refined by three-dimensional least-squares methods, to R 0·122 for 557 reflections. The atomic arrangement is consistent with the formulation as a molecular adduct, but there are also considerable contributions to the overall structure from the ionic form [AsF₂]⁺[SbF₆]^– and from an endless-chain arrangement.