Mg(MoO3)2 crystallizes in the monoclinic Pm space group. Mg(1) is bonded to one O(2), two equivalent O(5), and two equivalent O(6) atoms to form distorted MgO5 trigonal bipyramids that share corners with two equivalent Mo(1)O6 octahedra, corners with four equivalent Mg(1)O5 trigonal bipyramids, and edges with two equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles are 66°. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form distorted MoO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and edges with two equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-30°. In the second Mo site, Mo(2) is bonded to one O(3), one O(6), two equivalent O(2), and two equivalent O(4) atoms to form distorted MoO6 octahedra that share corners with four equivalent Mo(2)O6 octahedra, edges with two equivalent Mo(1)O6 octahedra, and edges with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 14-27°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Mo(1) atoms. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1) and two equivalent Mo(2) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mo(2) and two equivalent Mo(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mo(1) and two equivalent Mo(2) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one Mo(1) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to two equivalent Mg(1) and one Mo(2) atom.
Mg(MoO3)2 crystallizes in the monoclinic Pm space group. Mg(1) is bonded to one O(2), two equivalent O(5), and two equivalent O(6) atoms to form distorted MgO5 trigonal bipyramids that share corners with two equivalent Mo(1)O6 octahedra, corners with four equivalent Mg(1)O5 trigonal bipyramids, and edges with two equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles are 66°. The Mg(1)-O(2) bond length is 2.13 Å. Both Mg(1)-O(5) bond lengths are 2.11 Å. There is one shorter (2.05 Å) and one longer (2.06 Å) Mg(1)-O(6) bond length. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form distorted MoO6 octahedra that share corners with four equivalent Mo(1)O6 octahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and edges with two equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 8-30°. The Mo(1)-O(4) bond length is 2.25 Å. The Mo(1)-O(5) bond length is 1.90 Å. There is one shorter (1.77 Å) and one longer (2.22 Å) Mo(1)-O(1) bond length. Both Mo(1)-O(3) bond lengths are 2.00 Å. In the second Mo site, Mo(2) is bonded to one O(3), one O(6), two equivalent O(2), and two equivalent O(4) atoms to form distorted MoO6 octahedra that share corners with four equivalent Mo(2)O6 octahedra, edges with two equivalent Mo(1)O6 octahedra, and edges with two equivalent Mg(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 14-27°. The Mo(2)-O(3) bond length is 2.29 Å. The Mo(2)-O(6) bond length is 1.87 Å. There is one shorter (1.99 Å) and one longer (2.03 Å) Mo(2)-O(2) bond length. Both Mo(2)-O(4) bond lengths are 1.98 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Mo(1) atoms. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1) and two equivalent Mo(2) atoms. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Mo(2) and two equivalent Mo(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mo(1) and two equivalent Mo(2) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one Mo(1) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to two equivalent Mg(1) and one Mo(2) atom.