Mg(CuO)2 crystallizes in the monoclinic P2/m space group. Mg(1) is bonded in a square co-planar geometry to four equivalent Cu(1) and four equivalent O(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 10-coordinate geometry to four equivalent Mg(1), two equivalent Cu(1), and four equivalent O(1) atoms. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to four equivalent O(1) atoms. O(1) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), two equivalent Cu(1), and two equivalent Cu(2) atoms.
Mg(CuO)2 crystallizes in the monoclinic P2/m space group. Mg(1) is bonded in a square co-planar geometry to four equivalent Cu(1) and four equivalent O(1) atoms. All Mg(1)-Cu(1) bond lengths are 2.72 Å. All Mg(1)-O(1) bond lengths are 2.00 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 10-coordinate geometry to four equivalent Mg(1), two equivalent Cu(1), and four equivalent O(1) atoms. Both Cu(1)-Cu(1) bond lengths are 2.83 Å. There are two shorter (2.69 Å) and two longer (2.75 Å) Cu(1)-O(1) bond lengths. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Cu(2)-O(1) bond lengths are 1.98 Å. O(1) is bonded in a rectangular see-saw-like geometry to two equivalent Mg(1), two equivalent Cu(1), and two equivalent Cu(2) atoms.