MgNd2(CuO2)4 crystallizes in the tetragonal I-4 space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Cu(1) is bonded in a 3-coordinate geometry to one O(2) and two equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one Nd(1), one Nd(2), and one Cu(1) atom.
MgNd2(CuO2)4 crystallizes in the tetragonal I-4 space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. All Mg(1)-O(2) bond lengths are 2.06 Å. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Nd(1)-O(1) bond lengths are 2.44 Å. All Nd(1)-O(2) bond lengths are 2.60 Å. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Nd(2)-O(1) bond lengths are 2.64 Å. All Nd(2)-O(2) bond lengths are 2.49 Å. Cu(1) is bonded in a 3-coordinate geometry to one O(2) and two equivalent O(1) atoms. The Cu(1)-O(2) bond length is 1.86 Å. There is one shorter (1.85 Å) and one longer (1.95 Å) Cu(1)-O(1) bond length. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Nd(1), one Nd(2), and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mg(1), one Nd(1), one Nd(2), and one Cu(1) atom.