MgLa4(MoO6)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mo(2)O6 octahedra and corners with four equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-34°. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form MoO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-34°. In the second Mo site, Mo(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 34°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), one La(1), one La(2), and one Mo(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one La(1), two equivalent La(2), and one Mo(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Mg(1), one La(1), two equivalent La(2), and one Mo(1) atom. In the fourth O site, O(4) is bonded to one La(2), two equivalent La(1), and one Mo(2) atom to form a mixture of distorted corner and edge-sharing OLa3Mo trigonal pyramids. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one La(1), one La(2), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one La(2), and one Mo(1) atom.
MgLa4(MoO6)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mo(2)O6 octahedra and corners with four equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-34°. Both Mg(1)-O(1) bond lengths are 2.12 Å. Both Mg(1)-O(3) bond lengths are 2.17 Å. Both Mg(1)-O(5) bond lengths are 2.22 Å. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms. The La(1)-O(1) bond length is 2.41 Å. The La(1)-O(2) bond length is 2.73 Å. The La(1)-O(3) bond length is 2.62 Å. The La(1)-O(5) bond length is 2.50 Å. The La(1)-O(6) bond length is 2.50 Å. There is one shorter (2.37 Å) and one longer (2.58 Å) La(1)-O(4) bond length. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(4), one O(5), one O(6), two equivalent O(2), and two equivalent O(3) atoms. The La(2)-O(1) bond length is 2.50 Å. The La(2)-O(4) bond length is 2.58 Å. The La(2)-O(5) bond length is 2.54 Å. The La(2)-O(6) bond length is 2.42 Å. There is one shorter (2.41 Å) and one longer (2.78 Å) La(2)-O(2) bond length. There is one shorter (2.46 Å) and one longer (3.02 Å) La(2)-O(3) bond length. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form MoO6 octahedra that share corners with four equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-34°. Both Mo(1)-O(3) bond lengths are 2.07 Å. Both Mo(1)-O(5) bond lengths are 2.10 Å. Both Mo(1)-O(6) bond lengths are 1.91 Å. In the second Mo site, Mo(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles are 34°. Both Mo(2)-O(1) bond lengths are 2.07 Å. Both Mo(2)-O(2) bond lengths are 1.93 Å. Both Mo(2)-O(4) bond lengths are 2.01 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), one La(1), one La(2), and one Mo(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one La(1), two equivalent La(2), and one Mo(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Mg(1), one La(1), two equivalent La(2), and one Mo(1) atom. In the fourth O site, O(4) is bonded to one La(2), two equivalent La(1), and one Mo(2) atom to form a mixture of distorted corner and edge-sharing OLa3Mo trigonal pyramids. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one La(1), one La(2), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one La(1), one La(2), and one Mo(1) atom.