TABLE 4.

Five-coordinated, dihydrate copper structures in the CSD

Entries selected that exhibit two coordinating water molecules are listed by their CSD code, oxidation state, bond distances, and overall configuration. Notably, the mean Cu–N bond distance is shorter than the mean Cu–O distance. Two copper sites exhibit sqpy configuration (highlighted in red), but most are in a tbp configuration, as also observed in 4ALC. sqpy, square pyramidal; tbp, trigonal bipyramidal; dist., distorted; ax, axial; eq, equatorial.