MgTb2Cu2 crystallizes in the tetragonal P4/mbm space group. Mg(1) is bonded to eight equivalent Tb(1) and four equivalent Cu(1) atoms to form a mixture of distorted face and corner-sharing MgTb8Cu4 cuboctahedra. Tb(1) is bonded in a 6-coordinate geometry to four equivalent Mg(1) and six equivalent Cu(1) atoms. Cu(1) is bonded in a 9-coordinate geometry to two equivalent Mg(1), six equivalent Tb(1), and one Cu(1) atom.
MgTb2Cu2 crystallizes in the tetragonal P4/mbm space group. Mg(1) is bonded to eight equivalent Tb(1) and four equivalent Cu(1) atoms to form a mixture of distorted face and corner-sharing MgTb8Cu4 cuboctahedra. All Mg(1)-Tb(1) bond lengths are 3.38 Å. All Mg(1)-Cu(1) bond lengths are 3.02 Å. Tb(1) is bonded in a 6-coordinate geometry to four equivalent Mg(1) and six equivalent Cu(1) atoms. There are two shorter (2.90 Å) and four longer (2.92 Å) Tb(1)-Cu(1) bond lengths. Cu(1) is bonded in a 9-coordinate geometry to two equivalent Mg(1), six equivalent Tb(1), and one Cu(1) atom. The Cu(1)-Cu(1) bond length is 2.64 Å.