High oxidation state fluoro–rhenium species: preparation and characterization of [ReF 6 ] + , [ReF 4 O] + , and [Re 2 F 9 O 2 ] + , and the crystal structure of [Re 2 F 9 O 2 ] + [Sb 2 F 11 ] –

The fluoride ion donor properties of ReF7 and ReF5O have been demonstrated by the preparation of the adducts [ReF6]+[Sb3F16]–, [ReF6]+[Sb3F16]–, [ReF4O]+[AsF6]–, and [Re2F9O2]+[Sb2F11]–, which have been characterized by vibrational spectroscopy, mass spectrometry, and chemical analysis. The crystal structure of [Re2F9O2]+[Sb2F11]– consists of discrete fluorine-bridged dimeric anions, both of which consist of two bridged octahedra.