Materials Data on CuO by Materials Project

CuO crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. there are two inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.83 Å) and one longer (1.84 Å) Cu–O bond length. In the second Cu2+ site, Cu2+ is bonded to five O2- atoms to form distorted edge-sharing CuO5 square pyramids. There are a spread of Cu–O bond distances ranging from 1.89–2.56 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to three Cu2+ atoms. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to four Cu2+ atoms.