# Polycyclic nitrogen network?

So today I suddenly stricken with this structure and started to wonder if this polymeric structure of nitrogen is possible or not? If possible then what's its stability?

• With N, it will collapse instantly. With P, it might stand a chance. Dec 20 '17 at 17:47
• you could also go with squares/octagons like en.wikipedia.org/wiki/File:1-uniform_n2.svg (see en.wikipedia.org/wiki/…) - although as other commenters point out, these are extremely chemically unlikely! (it's this one en.wikipedia.org/wiki/File:1-uniform_n4.svg) Dec 20 '17 at 18:05
• Yikes! Where was this dreamed up? Dec 20 '17 at 19:15
• Looks like someone tried out his chemicals sketching software. ? Polmeric nitrogen exists (at very high pressures), but the structure is quite different. phys.org/news/2004-08-polymeric-nitrogen-synthesised.html
– Karl
Dec 20 '17 at 19:57
• What do you mean by "possible" and "stable"? Dec 20 '17 at 20:56

I searched CCDC for the infinite structures with the following building block:

where where each vertex contains any non-metal atom linked by any type of bond. The only known crystal structure that would meet these criteria is $\ce{[B12]2[CBC][C2]Mg_{1.42}}$ where $\ce{B12}$ icosahedra are linked via $\ce{B–C}$ and $\ce{B–B}$ bonds forming the moieties of the previously shown topology:

Figure 2. Projection of the $\ce{B25C4Mg_{1.42}}$ structure onto the $0ac$ plane (the block of icosahedra of boron carbide structure is marked by shading).

Unfortunately, no similar structures are found for nitrogen yet. Also, the structural motif breaks on boron clusters, but this is the closest as I was able to get.

### Reference

1. Ponomarev, V. I.; Konovalikhin, S. V.; Kovalev, I. D.; Vershinnikov, V. I.; Borovinskaya, I. P. Mendeleev Communications 2014, 24 (1), 15–16. DOI: 10.1016/j.mencom.2013.12.004.
• After a bit of research i found sciencedirect.com/science/article/pii/S0927025614008209, but ccdc structure of nitrogen isn't possible/found yet Dec 21 '17 at 7:41
• @G.OVed Ah, the mighty USPEX – this program predicted numerous structures at extreme conditions. Actually, you can answer your own question with this, I think the article is relevant. Dec 21 '17 at 7:43