MgLa3Cu4(P2O)2 crystallizes in the orthorhombic Immm space group. Mg(1) is bonded to two equivalent La(1), two equivalent Cu(1), and four equivalent P(2) atoms to form a mixture of corner and edge-sharing MgLa2Cu2P4 hexagonal bipyramids. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent Mg(1), four equivalent Cu(2), and two equivalent P(1) atoms. In the second La site, La(2) is bonded in a 4-coordinate geometry to two 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 7-coordinate geometry to one Mg(1), two equivalent La(2), two equivalent P(1), and two equivalent P(2) atoms. In the second Cu site, Cu(2) is bonded in a 6-coordinate geometry to two equivalent La(1), two equivalent P(1), and two equivalent P(2) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 4-coordinate geometry to one La(1), two equivalent Cu(1), and two equivalent Cu(2) atoms. In the second P site, P(2) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Cu(1), and two equivalent Cu(2) atoms. O(1) is bonded in a 4-coordinate geometry to four equivalent La(2) atoms.
MgLa3Cu4(P2O)2 crystallizes in the orthorhombic Immm space group. Mg(1) is bonded to two equivalent La(1), two equivalent Cu(1), and four equivalent P(2) atoms to form a mixture of corner and edge-sharing MgLa2Cu2P4 hexagonal bipyramids. Both Mg(1)-La(1) bond lengths are 2.47 Å. Both Mg(1)-Cu(1) bond lengths are 2.65 Å. All Mg(1)-P(2) bond lengths are 2.57 Å. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent Mg(1), four equivalent Cu(2), and two equivalent P(1) atoms. All La(1)-Cu(2) bond lengths are 3.14 Å. Both La(1)-P(1) bond lengths are 3.30 Å. In the second La site, La(2) is bonded in a 4-coordinate geometry to two equivalent Cu(1) and four equivalent O(1) atoms. Both La(2)-Cu(1) bond lengths are 3.26 Å. There are two shorter (2.32 Å) and two longer (2.66 Å) La(2)-O(1) bond lengths. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 7-coordinate geometry to one Mg(1), two equivalent La(2), two equivalent P(1), and two equivalent P(2) atoms. Both Cu(1)-P(1) bond lengths are 2.55 Å. Both Cu(1)-P(2) bond lengths are 2.36 Å. In the second Cu site, Cu(2) is bonded in a 6-coordinate geometry to two equivalent La(1), two equivalent P(1), and two equivalent P(2) atoms. Both Cu(2)-P(1) bond lengths are 2.27 Å. Both Cu(2)-P(2) bond lengths are 2.61 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 4-coordinate geometry to one La(1), two equivalent Cu(1), and two equivalent Cu(2) atoms. In the second P site, P(2) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Cu(1), and two equivalent Cu(2) atoms. O(1) is bonded in a 4-coordinate geometry to four equivalent La(2) atoms.