No abstract

Ammonium hexafluorof errate(III), (NH4)3FeFe, and ammonium hexafluoroaluminate, (NH4)3A1F6, decompose 011 heating with an initial loss of 2 moles of ammonium fluoride, forming ammonium tetrafluoroferrate(III), iXHaFeFa (at ca. 140°), and ammonium tetrafluoroaluminate, NHaAlF4 (at ca. 170'). Further heating results in the gradual loss of ammonium fluoride, the final products being iron(II1) fluoride mixed with oxide (at ca. 285") and ?-aluminum fluoride, a new crystalline form (at ca. 300').The intermediate, ammonium tetrafluoroferrate(III), was found to be tetragonal, a = 3.78, c = 6.36 A. It can also be prepared by direct reaction of iron(II1) fluoride and ammonium fluoride a t 180".The structural relationships of the compounds are discussed.

No abstract

No abstract

No abstract