Ba2MgY(CuO2)4 crystallizes in the monoclinic P2/m space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(4) atoms. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one O(1) and three equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Cu(1), and one Cu(2) atom. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Y(1), and two equivalent Cu(1) atoms to form a mixture of distorted edge and corner-sharing OBa2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Y(1), and two equivalent Cu(1) atoms. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Mg(1) and three equivalent Cu(2) atoms.
Ba2MgY(CuO2)4 crystallizes in the monoclinic P2/m space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms. Both Ba(1)-O(2) bond lengths are 2.86 Å. There is one shorter (3.02 Å) and one longer (3.04 Å) Ba(1)-O(3) bond length. There are two shorter (2.81 Å) and two longer (2.82 Å) Ba(1)-O(1) bond lengths. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(4) atoms. All Mg(1)-O(4) bond lengths are 2.22 Å. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. All Y(1)-O(2) bond lengths are 2.39 Å. There are two shorter (2.45 Å) and two longer (2.48 Å) Y(1)-O(3) bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. The Cu(1)-O(1) bond length is 2.62 Å. Both Cu(1)-O(2) bond lengths are 2.03 Å. Both Cu(1)-O(3) bond lengths are 1.88 Å. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to one O(1) and three equivalent O(4) atoms. The Cu(2)-O(1) bond length is 1.85 Å. There are a spread of Cu(2)-O(4) bond distances ranging from 1.98-2.23 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Cu(1), and one Cu(2) atom. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Y(1), and two equivalent Cu(1) atoms to form a mixture of distorted edge and corner-sharing OBa2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Y(1), and two equivalent Cu(1) atoms. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Mg(1) and three equivalent Cu(2) atoms.