HIGH ENERGY OXIDIZERS IN SOLUTION
Abstract
When a mixture of nitrogen trifluoride, fluorine, and antimony pentafluoride is heated under pressure, the salt NF4SbF6 is formed. This is the first derivative of the perfluoroammonium cation NF4(+) to be observed. It was characterized by evidence obtained from thermal decomposition, hydrolysis, elemental analyses, and fluorine nmr spectra. The salt is stable in a very dry atmosphere and at 200 C in vacuo but decomposes rapidly above 300 C to NF3, F2, and SbF5. Elemental analysis was carried out by determination of the quantity and identity of the gases evolved on hydrolysis followed by analysis of the hydrolysate. Hydrolysis of NF4(+) quantitatively produces NF3 and O2 in a two to one mole ratio. These analyses showed that the empirical composition of the solid was NSbF10, and that the oxidation number of nitrogen in the compound is five. The product is from 96 to 99% pure as isolated from the monel reactor, the balance consisting mainly of Ni(SbF6)2. The fluorine nmr spectra were obtained from the salt dissolved in anhydrous HF and were consistent with the presence of SbF6(-) and of a species of the type NFx. From this and other evidence the structure of the salt was shown to be NF4(+)SbF6(-). Because the nmr spectra showed that all fluorines attached to nitrogen are equivalent, the NF4(+) ion is almost certainly tetrahedral.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 14, 1966
- Accession Number
- AD0378056
Entities
People
- M. E. Hill
- R. S. Stringham
- R. T. Rewick
- W. E. Tolberg
Organizations
- SRI International