Materials Data on C3N4 by Materials Project

C3N4 crystallizes in the trigonal R3m space group. The structure is two-dimensional and consists of three C3N4 sheets oriented in the (0, 0, 1) direction. C4+ is bonded in a trigonal planar geometry to three N3- atoms. There is two shorter (1.33 Å) and one longer (1.46 Å) C–N bond length. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded in a bent 120 degrees geometry to two equivalent C4+ atoms. In the second N3- site, N3- is bonded in a trigonal planar geometry to three equivalent C4+ atoms.