Nitrogen Trifluoride NF

Fluorine reacts with ammonia in the presence of ammonium acid fluoride to give nitrogen trifluoride, NF. This compound can be used as a fluorine source in the high power hydrogen fluoride—deuterium fluoride (HF/DF) chemical lasers and in the production of microelectronic siUcon-based components. 

Problem 2.33 Nitrogen trifluoride (NF,) and ammonia (NH,) have an electron pair at the fourth corner of a tetrahedron and have similar electronegativity differences between the elements (1.0 for N and F and 0.9 for N and H). Explain the larger dipole moment of ammonia (I.46D) as compared with that of NF, (0.24 D). ... 

NITROGEN TRIFLUORIDE NF, None Water, oil. grease oxidizatile materials ammonia, carbon monoxide, methane, hydrogen, hydrogen sulfide, active metals oxides Not combustible ... 

Ammonia. Ammonia (qv) reacts with excess fluorine ia the vapor phase to produce N2, NF, N2F2, HF, and NH F. This reaction is difficult to control ia the vapor phase because of the iatense heat of reaction, and ia some cases only N2 and HF are produced. Nitrogen trifluoride was obtained ia 6% yields ia a gas-phase reaction over copper (42). Yields of ca 60% are achieved by the reaction of fluorine and ammonia ia a molten ammonium acid fluoride solution (43,44). 

Predict the electron arrangement and the shape of a nitrogen trifluoride molecule, NF,. 

The only known molecule of composition CC1 is carbon tetrachloride CCl, CCI2, CCI3 or CCI5 do not exist as stable molecules. Similarly the only known molecule of composition NF was nitrogen trifluoride, of composition OF oxygen difluoride, and of composition H F hydrogen fluoride, HF. 

The flame reactions of alkali metal vapors (Li, Na, Cs) with nitrogen trifluoride between about 500 and 1000 K and at a few Torr show strong chemiluminescence. The emission results from electronically excited alkali metal atoms. Photon yields of up to 3% were measured. The excitation mechanism was assumed to involve the formation of an excited species and the transfer of energy from this species to the alkali metal atom (A) according to the simplified sequence [1,2] A +NF,->AF(v) +NF,, ... 

C Fj-NFa), trifluoromethyliminosulphur diiluoride [- - CFj-NFa, (CFa)2NF], pentafluoroethyliminosulphur difluoride CaFs NFa), cyanuric fluoride CFs-NF, (CFa)jNF], thiocyanuric acid [-< CFj-NFj, (CF8)aNF], melamine [- CF3 NF2, (CFs)aNF, CFa(NFa)a], methyl thiocyanate (-> CFa NFj), and methyl isothiocyanate CFs-NFa) carbon tetra-fluoride and nitrogen trifluoride were the major products from these fluorina-tions, and a study has been made of the production of the latter via electrochemical fluorination of urea and related compounds. Details of the production of AtALdifiuorotrifluoromethylamine via injection of carbon tetrafluoride into a nitrogen plasma at 1500—6000 K and direct fluorination of potassium cyanide" have appeared in the patent literature preparation of this difluoroamine by u.v. irradiation of a mbcture of hexafluoro-acetone and tetrafluorohydrazine has also been described, and the new compounds CFCla-NFa, CClj-NFg, and ClS-CCIj-NF, have been obtained by photolysis of the hydrazine in the presence of thiocarbonyl chloride. ... 

Treatment of the imine CFC1 NF with hydrogen fluoride at ISCC has been claimed to yield A -fluorotrifluoromethylamine, CFj-NHF. This amine was also found as a by-product in material (b.p. - 5-5 °C) obtained by heating the imine with mercuric fluoride at 125 °C and thought to possess the structure CF,-N CF-NFj on the basis of elemental analysis, and mass, n.m.r. (no data quoted), and i.r. (vc-s 1670 cm ) spectroscopic analysis one of the products (b.p. -4 to -3°C) of co-pyrolysis of perfluoro(methylene-methylamine) with nitrogen trifluoride over caesium fluoride in a steel tube... 

Nitrogen oxide trifluoride is undoubtedly of some theoretical interest there is however no difficulty in formulating the bonding in a conventional way, with the oxygen joined to NF, by a semi-ionic bond =N+-0 . 

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