CaC2 crystallizes in the monoclinic C2/m space group. Ca(1) is bonded in a 9-coordinate geometry to four equivalent C(1) and five equivalent C(2) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 5-coordinate geometry to four equivalent Ca(1) and one C(1) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to five equivalent Ca(1) and one C(2) atom.
CaC2 crystallizes in the monoclinic C2/m space group. Ca(1) is bonded in a 9-coordinate geometry to four equivalent C(1) and five equivalent C(2) atoms. There are a spread of Ca(1)-C(1) bond distances ranging from 2.61-2.77 Å. There are a spread of Ca(1)-C(2) bond distances ranging from 2.57-2.92 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 5-coordinate geometry to four equivalent Ca(1) and one C(1) atom. The C(1)-C(1) bond length is 1.25 Å. In the second C site, C(2) is bonded in a 6-coordinate geometry to five equivalent Ca(1) and one C(2) atom. The C(2)-C(2) bond length is 1.25 Å.