Mg(MoO2)4 crystallizes in the trigonal R-3m space group. Mg(1) is bonded to six equivalent O(1) atoms to form MgO6 octahedra that share corners with six equivalent Mo(2)O6 octahedra and edges with six equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 9°. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MoO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mo(2)O6 octahedra, and edges with four equivalent Mo(1)O6 octahedra. In the second Mo site, Mo(2) is bonded to six equivalent O(1) atoms to form MoO6 octahedra that share corners with six equivalent Mg(1)O6 octahedra and edges with six equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 9°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(2), and two equivalent Mo(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to three equivalent Mo(1) atoms.
Mg(MoO2)4 crystallizes in the trigonal R-3m space group. Mg(1) is bonded to six equivalent O(1) atoms to form MgO6 octahedra that share corners with six equivalent Mo(2)O6 octahedra and edges with six equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 9°. All Mg(1)-O(1) bond lengths are 2.24 Å. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MoO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra, edges with two equivalent Mo(2)O6 octahedra, and edges with four equivalent Mo(1)O6 octahedra. Both Mo(1)-O(2) bond lengths are 2.08 Å. All Mo(1)-O(1) bond lengths are 2.12 Å. In the second Mo site, Mo(2) is bonded to six equivalent O(1) atoms to form MoO6 octahedra that share corners with six equivalent Mg(1)O6 octahedra and edges with six equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles are 9°. All Mo(2)-O(1) bond lengths are 2.24 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(2), and two equivalent Mo(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to three equivalent Mo(1) atoms.