S4N4 As A Precursor To Other S-N Compounds
Many important S-N compounds are prepared from S4N4. Reaction with piperidine generates −:
- 3 S4N4 + 4 C5H10NH → (C5H10NH2)+− + (C5H10N)2S + ⅜ S8 + N2
It is indicative of the richness of this area that a related cation is also known, i.e. +.
Treatment with tetramethylammonium azide produces the heterocycle −:
- S4N4 + NMe4N3 → NMe4 + ⅛ S8 + 2 N2
In the language of electron counting, − has 10 pi-electrons: 2e−/S plus 1e−/N plus 1e− for the negative charge.
In an apparently related reaction, the use of PPN+N3 gives a salt containing the blue − anion:
- 2 S4N4 + PPN(N3) → PPN + ½ S8 + 5 N2
The anion NS4− has a chain structure described using the resonance − ↔ −.
Read more about this topic: Tetrasulfur Tetranitride
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