Nitrogen Fluoride Chemistry
Abstract
The isomerization of trans-N2F2 to cis-N2F2 going through N2F(+)AsF6(-) is unpredictable, erratic, requires 2 steps, and consumes an equimolar amount of AsF5. It was found that catalytic amounts of SbF5 at 3OC can achieve this isomerization, but still result in substantial N2F2 losses due to N2F(+)SbF6(-) formation. When the reaction is carried out at 60C, surprisingly NF4(+)SbF6(-).nSbF5 is formed. The crystal structures of N2F(+)SbF6(-) (disordered), N2F(+)SbF6(-) (disordered), N2F(+)Sb2F11(-) (ordered), and NF4(+)Sb2F11(-) were determined and are discussed. AlF3 was also studied as a catalyst for the N2F2 isomerization and was found to be an ideal catalyst resulting in very high conversions of trans-N2F2 and high yields of cis-N2F2. The AlF3 can be used repeatedly without loss of activity or N2F(+) salt formation. Cis-N2F2 forms with SnF4 at low temperatures a 2:1 salt, (N2F(+))2SnF6(2-), that slowly loses N2F2 at room temperature to give N2F(+)SnF5(-). The crystal structure of H3NF(+)CF3SO3(-) was also determined and exhibits a relatively long N-F bond.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 12, 2002
- Accession Number
- ADA408824
Entities
People
- Ashwani Vij
- F. Tham
- Karl O. Christe
- Vandana Vij
- William L. Wilson