Materials Data on Si5C3 by Materials Project

Si5C3 crystallizes in the trigonal R3 space group. The structure is three-dimensional and consists of three silicon molecules and one Si4C3 framework. In the Si4C3 framework, there are two inequivalent Si+2.40+ sites. In the first Si+2.40+ site, Si+2.40+ is bonded in a trigonal planar geometry to three equivalent C4- atoms. All Si–C bond lengths are 1.85 Å. In the second Si+2.40+ site, Si+2.40+ is bonded in a bent 120 degrees geometry to two equivalent C4- atoms. There is one shorter (1.78 Å) and one longer (1.79 Å) Si–C bond length. C4- is bonded in a trigonal planar geometry to three Si+2.40+ atoms.