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Joseph A Neff

William D English

Tris-tetrafluorammonium hexafluoraluminate, (NF.sub.4).sub.3 AlF.sub.6, a new compound, is synthesized by forming a mixture of solid aluminum trichloride in a solution of a molar excess tetrafluorammonium bifluoride in anhydrous hydrogen fluoride, at a temperature of about -78.degree. C. or less. The mix is then rapidly heated to a temperature of about 40.degree. C. to the decomposition temperature of the product until all the solids dissolve. The solution containing the dissolved aluminum trichloride is evaporated under vacuum conditions to cause crystallization of (NF.sub.4).sub.3 AlF.sub.6.

Tris-tetrafluorammonium hexafluoraluminate and its method of preparation

The compound NF.sub.4 MF.sub.6 where M is a Group V metalloid is reacted with a fluoride of sodium to yield tetrafluorammonium bifluoride in solution with hydrogen fluoride and a precipitate of the formula NaMF.sub.6. The preferred metaloid is antimony. The formed tetrafluorammonium bifluoride may be converted to NF.sub.4 BF.sub.4 by reaction with BF.sub.3.

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Joseph A Neff