Materials Data on Mg2C3 by Materials Project
Mg2C3 crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. Mg2+ is bonded in a 3-coordinate geometry to five C+1.33- atoms. There are a spread of Mg–C bond distances ranging from 2.21–2.47 Å. There are two inequivalent C+1.33- sites. In the first C+1.33- site, C+1.33- is bonded in a 2-coordinate geometry to two equivalent Mg2+ and two equivalent C+1.33- atoms. Both C–C bond lengths are 1.33 Å. In the second C+1.33- site, C+1.33- is bonded to four equivalent Mg2+ and one C+1.33- atom to form a mixture of distorted corner and edge-sharing CMg4C trigonal bipyramids.
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