Materials Data on Ca3Cu2(ClO2)2 by Materials Project

Abstract

Ca3Cu2O4Cl2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Ca2+ sites. In the first Ca2+ site, Ca2+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Ca–O bond lengths are 2.53 Å. In the second Ca2+ site, Ca2+ is bonded in a 9-coordinate geometry to four equivalent O2- and five equivalent Cl1- atoms. All Ca–O bond lengths are 2.49 Å. There are four shorter (2.98 Å) and one longer (3.28 Å) Ca–Cl bond lengths. Cu2+ is bonded in a distorted rectangular see-saw-like geometry to four equivalent O2- and one Cl1- atom. All Cu–O bond lengths are 1.94 Å. The Cu–Cl bond length is 2.83 Å. O2- is bonded to four Ca2+ and two equivalent Cu2+ atoms to form a mixture of distorted face, edge, and corner-sharing OCa4Cu2 octahedra. The corner-sharing octahedra tilt angles range from 0–66°. Cl1- is bonded in a 6-coordinate geometry to five equivalent Ca2+ and one Cu2+ atom.