Nitrogen pentafluoride

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Nitrogen pentafluoride is a hypothetical chemical compound of nitrogen and fluorine with the chemical formula NF5. It is hypothesized to exist based on the existence of the pentafluorides of the atoms below nitrogen in the periodic table, such as phosphorus pentafluoride. Theoretical models of the nitrogen pentafluoride molecule are either a trigonal bipyramidal covalently bound molecule with symmetry group D3h, or [NF4]F (tetrafluoroammonium fluoride), which would be an ionic solid. A variety of other tetrafluoroammonium salts are known ([NF4]X), as are fluoride salts of other ammonium cations ([NR4]F). In 1966, W. E. Tolberg first synthesized a five-valent nitrogen compound of nitrogen and fluorine when tetrafluoroammonium compounds, tetrafluoroammonium hexafluoroantimonate(V) [NF4][SbF6] and tetrafluoroammonium hexafluoroarsenate(V) [NF4][AsF6] were made. In 1971 C. T. Goetschel announced the preparation of [NF4][BF4] and also produced a white solid assumed to be tetrafluoroammonium fluoride ([NF4]F). This was made by treating nitrogen trifluoride and fluorine with 3 MeV electron radiation at 77 K. It decomposed above 143 K back into those ingredients. Theoretical studies also show the ionic compound is very likely to decompose to nitrogen trifluoride and fluorine gas. Karl O. Christe synthesised bis(tetrafluoroammonium) hexafluoronickelate(IV) ([NF4])2[NiF6]. He also prepared compounds with manganese, a fluorouranate, tetrafluoroammonium perchlorate [NF4]ClO−4, tetrafluoroammonium fluorosulfate [NF4]SO3F and [N2F3] (trifluorodiazenium) salts.