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The preparation of chromium tetrafluoride reported by von LVartenberg 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 tri-oxide, pyridine, halogen fluorides, or selenium tetrafluoride a t ordinary temperatures. I n boiling bromine trifluoride or selenium tetrafluoride, chromium tetrafluoride is reduced t o lower fluorides, while a refluxing mixture of bromine tri-and penta-fluorides converts CrF4 to CrOF3.0.25BrF3. Chromium (IV) fluoride complexes of the types ACrF6 (XI = K, Rb, or Cs) and AzCrE'e (A = K or Cs) have been prepared and their magnetic moments and lattice constants have been determined.

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