C-N BONDING

It is an important observation that (a) C-N 3d extended structures are notoriously difficult to make and are probably never observed in crystalline form while (b) H-C-N heterocycles form the basis of the informational structure of life, apparently, and they are planar and have delocalized pi bonding in the H-C-N heterocycle ring systems that they form. It is as if H-C-N bonding is designed mostly to form heterocycles in the informational architecture of life on Earth...and maybe not for anything else. Where B-N and C and Si-C bonding etc. may be important for 3-3-4 networks.