Molecular Structure of organic compounds: VSEPR: AXnEm type and π systems: the Nitrogen case

N: AX3E N: AX3E N: AX3 N: AX2E
NH3 pyrrolidine pyrrole 1pyrroline

N: trigonal pyramid

N: trigonal pyramid

N: triangle

N: bent
Ammonia, NH3 Pyrrolidine, C4H9N Pyrrole, C4H5N 1-pyrroline, C4H7N

All these geometries were theoretically found at the DFT-B3LYP level of theory (6-31G(d,p) basis sets for light atoms and Stuttgart ECPs for the heaviest ones)

See also the Hybrid Orbitals page

More information about VSEPR