Si2CN4 crystallizes in the orthorhombic Aea2 space group. Si(1) is bonded to one N(1) and three equivalent N(2) atoms to form corner-sharing SiN4 tetrahedra. C(1) is bonded in a linear geometry to two equivalent N(1) atoms. There are two inequivalent N sites. In the first N site, N(1) is bonded in a linear geometry to one Si(1) and one C(1) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to three equivalent Si(1) atoms.
Si2CN4 crystallizes in the orthorhombic Aea2 space group. Si(1) is bonded to one N(1) and three equivalent N(2) atoms to form corner-sharing SiN4 tetrahedra. The Si(1)-N(1) bond length is 1.69 Å. There is one shorter (1.72 Å) and two longer (1.73 Å) Si(1)-N(2) bond lengths. C(1) is bonded in a linear geometry to two equivalent N(1) atoms. Both C(1)-N(1) bond lengths are 1.20 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a linear geometry to one Si(1) and one C(1) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to three equivalent Si(1) atoms.