Zur Struktur und Reaktivität des Diammoniumhexafluoromanganats(IV)
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Contributors
Abstract
Electrolytic oxidation of an aqueous suspension of MnF2 containing NH4F, and subsequent crystallization in 40% HF yields yellow crystals of (NH4)(2)MnF6. It crystallizes in the hexagonal K2MnF6 type structure with the space group P6(3)mc and a = 5.903; c = 9.565 Angstrom; Z = 2. With in situ powder diffraction studies it is shown, that (NH4)(2)MnF6 is gradually reduced in a NH3 atmosphere between 30 and 230 degrees C to afford (NH4)(3)MnF6, (NH4)(2)MnF5, and finally NH4MnF3. (NH4)(3)MnF6, thereby, forms a hitherto unknown cubic (a = 9.082 Angstrom) high temperature modification with the cryolite type structure. Under N-2 the thermal decomposition of (NH4)(2)MnF6 proceeds via NH4MnF4 to yield MnF2.
| Translated title of the contribution | About the structure and reactivity of diammonium hexafluoromanganate(IV) |
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Details
| Original language | German |
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| Pages (from-to) | 1259-1263 |
| Number of pages | 5 |
| Journal | Zeitschrift fur Anorganische und Allgemeine Chemie |
| Volume | 623 |
| Issue number | 8 |
| Publication status | Published - Aug 1997 |
| Peer-reviewed | Yes |
External IDs
| Scopus | 0040562633 |
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Keywords
Keywords
- ammonium fluoromanganates, redox behavior, di(ammonium) hexafluoromanganate(IV), crystal structure, tri(ammonium) hexafluoromanganate(III), high temperature modification