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|Section2= |Section3= |Section8= }} Nitrogen pentafluoride is a theoretical compound of nitrogen and fluorine that 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 (NF5) molecule are either a trigonal bipyramidal covalently bound molecule with symmetry group D3h, or NF4+F−, which would be an ionic solid. Also, a related compound NH4+F− is known. ==Ionic solid== In 1966 W. E. Tolberg first synthesized a five valent nitrogen compound of nitrogen and fluorine when tetrafluoroammonium compounds, tetrafluoroammonium heaxafluoroantimonate NF4SbF6 and tetrafluoroammonium heaxafluoroarsenate NF4AsF6 were made. In 1971 C. T. Goetschel announced the preparation of NF4BF4 and also produced a white solid assumed to be tetrafluoroammonium fluoride (NF4+F−). This was made by treating nitrogen trifluoride and fluorine with 3MeV electron radiation at 77K. It decomposed above 143K 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 (NF4)2NiF6. He also prepared compounds with manganese, a fluorouranate, a perchlorate, a fluorosulfate and N2F3+ salts. Christe attempted to make NF4F by metathesis of NF4SbF6 with CsF in HF solvent at 20 °C. However, a variant, tetrafluoroammonium bifluoride (NF4HF2·nHF), was produced. At room temperature it was a milky liquid, but when cooled turned pasty. At −45 °C it had the form of a white solid. When reheated it frothed, giving off F2, HF and NF3 as gases.〔This has CAS number 71485-49-9.〔Tetrafluoroammonium bifluoride〕 I. J. Solomon believed that nitrogen pentafluoride was produced by the thermal decomposition of NF4AsF6, but experimental results were not reproduced. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nitrogen pentafluoride」の詳細全文を読む スポンサード リンク
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