Zur Kenntnis der Ammonium-fluoromanganate(III)

Investigation of the system MnF₃–NH₄F–HF–H₂O revealed considerable hydrolysis even in highly acidic media. NH₄MnF₄ with a tetragonal unit cell,a=7.752 (6),c=6.153 (12) Å andZ=4, was isolated together with the already known (NH₄)₂MnF₅ and (NH₄)₃MnF₆. No splittings of the valence modes were observed with hexa- and penta-fluoromanganates, although the deformation of the octahedra was evident. Splitting was characteristic of the tetrafluoro compound. The spectrum of ammonium ion indicated increasing hydrogenbonding in the sequence hexa-, penta-, tetra-fluoromanganate.

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9. Mitt.: Mh. Chem.106, 1333 (1975).