Materials Data on CaC2O5 by Materials Project
CaC2O5 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.38–2.60 Å. There are two inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both C–O bond lengths are 1.27 Å. In the second C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. Both C–O bond lengths are 1.26 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Ca2+ and one C4+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ca2+ and one C4+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Ca2+ atom.