Polynitrogen chemistry:: Preparation and characterization of (N5)2SnF6, N5SnF5, and N5B(CF3)4

Metathetical processes were used to convert N5SbF6 into N-5[B(CF3)(4)] and (N-5)(2)SnF6. The latter salt is especially noteworthy because it contains two N-5(+) ions per anion, thus demonstrating that salts with touching polynitrogen cations can be prepared. This constitutes an important milestone towards our ultimate goal of synthesizing a stable, ionic nitrogen allotrope. The stepwise decomposition of (N-5)(2)SnF6 yielded N5SnF5. Multinuclear NMR spectra show that in HF the SnF5- ion exists as a mixture of Sn2F10O2- and Sn4F204- ions. Attempts to isolate FN5 from the thermolysis of (N-5)(2)SnF6 were unsuccessful, yielding only the expected decomposition products, FN3, N-2, trans-N2F2, NF3, and N-2.