Tetrafluoroammonium
The tetrafluoroammonium cation (also known as perfluoroammonium) is a positively charged polyatomic ion with chemical formula NF+
4. It is equivalent to the ammonium ion where the hydrogen atoms surrounding the central nitrogen atom have been replaced by fluorine. Tetrafluoroammonium ion is isoelectronic with tetrafluoromethane CF
4, trifluoramine oxide ONF
3 and the tetrafluoroborate BF−
4 anion.
2D model of the tetrafluoroammonium ion | |
| Names | |
|---|---|
| IUPAC name
Tetrafluoroammonium | |
| Identifiers | |
3D model (JSmol) |
|
| ChEBI | |
| ChemSpider | |
| 2028 | |
PubChem CID |
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| Properties | |
| F4N+ | |
| Molar mass | 90.000 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
The tetrafluoroammonium ion forms salts with a large variety of fluorine-bearing anions. These include the bifluoride anion (HF−
2), tetrafluorobromate (BrF−
4), metal pentafluorides (MF−
5 where M is Ge, Sn, or Ti), hexafluorides (MF−
6 where M is P, As, Sb, Bi, or Pt), heptafluorides (MF−
7 where M is W, U, or Xe), octafluorides (XeF2−
8), various oxyfluorides (MF
5O−
where M is W or U; FSO−
3, BrF
4O−
), and perchlorate (ClO−
4). Attempts to make the nitrate salt, NF
4NO
3, were unsuccessful because of quick fluorination: NF+
4 + NO−
3 → NF
3 + FONO
2.