Abstract
The preparation of chromium tetrafluoride reported by von Wartenberg has been repeated, and some physical and chemical properties have been studied. Chromium tetrafluoride is surprisingly inert and does not react with ammonia, sulphur di- or trioxide, pyridine, halogen fluorides, or selenium tetrafluoride at ordinary temperatures. In boiling bromine trifluoride or selenium tetrafluoride, chromium tetrafluoride is reduced to lower fluorides, while a refluxing mixture of bromine tri- and pentafluorides converts CrF4 to CrOF3•0.25BrF3. Chromium (IV) fluoride complexes of the types ACrF5 (A = K, Rb, or Cs) and A2CrF6 (A = K or Cs) have been prepared and their magnetic moments and lattice constants have been determined.
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