Tetrafluoro-orthoperjodsäure und Joddioxidtrifluorid

Of the new iodine(VII) compounds HOIOF₄ and IO₂F₃ the preparation and chemical and physical properties are reported. According to the ¹⁹F nuclear magnetic resonance spectra, both exist in two non-separable isomeres. HOIOF₄ is a very strong acid. IO₂F₃ forms yellow needles, which are not wetted by water. Both are very strong oxidising species. IO₂F₃ is probably the first trigonal-bipyramidal molecule with two simultaneously existing isomeres.