Mg(CuO2)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(5), and one O(6) atom. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(7), and one O(8) atom. In the second Cu site, Cu(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(5), one O(6), and one O(8) atom. In the third Cu site, Cu(3) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(7) atom. In the fourth Cu site, Cu(4) is bonded in a 5-coordinate geometry to one O(2), one O(5), one O(6), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cu(2), one Cu(3), and one Cu(4) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mg(1), one Cu(1), and one Cu(3) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Cu(1), and one Cu(3) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mg(1), one Cu(2), and one Cu(4) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mg(1), one Cu(2), and one Cu(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(3), and one Cu(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one Cu(4) atom.
Mg(CuO2)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(5), and one O(6) atom. The Mg(1)-O(3) bond length is 2.05 Å. The Mg(1)-O(4) bond length is 2.05 Å. The Mg(1)-O(5) bond length is 2.05 Å. The Mg(1)-O(6) bond length is 2.05 Å. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(7), and one O(8) atom. The Cu(1)-O(1) bond length is 1.86 Å. The Cu(1)-O(3) bond length is 1.87 Å. The Cu(1)-O(4) bond length is 1.87 Å. The Cu(1)-O(7) bond length is 1.85 Å. The Cu(1)-O(8) bond length is 2.27 Å. In the second Cu site, Cu(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(5), one O(6), and one O(8) atom. The Cu(2)-O(1) bond length is 2.26 Å. The Cu(2)-O(2) bond length is 1.85 Å. The Cu(2)-O(5) bond length is 1.87 Å. The Cu(2)-O(6) bond length is 1.87 Å. The Cu(2)-O(8) bond length is 1.86 Å. In the third Cu site, Cu(3) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(7) atom. The Cu(3)-O(1) bond length is 1.85 Å. The Cu(3)-O(2) bond length is 2.27 Å. The Cu(3)-O(3) bond length is 1.88 Å. The Cu(3)-O(4) bond length is 1.87 Å. The Cu(3)-O(7) bond length is 1.86 Å. In the fourth Cu site, Cu(4) is bonded in a 5-coordinate geometry to one O(2), one O(5), one O(6), one O(7), and one O(8) atom. The Cu(4)-O(2) bond length is 1.86 Å. The Cu(4)-O(5) bond length is 1.87 Å. The Cu(4)-O(6) bond length is 1.87 Å. The Cu(4)-O(7) bond length is 2.27 Å. The Cu(4)-O(8) bond length is 1.85 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cu(2), one Cu(3), and one Cu(4) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mg(1), one Cu(1), and one Cu(3) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Cu(1), and one Cu(3) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mg(1), one Cu(2), and one Cu(4) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mg(1), one Cu(2), and one Cu(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(3), and one Cu(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one Cu(4) atom.