Mg(MoO2)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form MgO6 octahedra that share corners with two equivalent Mo(2)O6 octahedra, corners with two equivalent Mo(4)O6 octahedra, edges with two equivalent Mo(1)O6 octahedra, edges with two equivalent Mo(3)O6 octahedra,  a faceface with one Mo(2)O6 octahedra, and  a faceface with one Mo(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form MoO6 octahedra that share corners with four equivalent Mo(2)O6 octahedra, corners with four equivalent Mo(4)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mo(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-58°. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(3)O6 octahedra, edges with two equivalent Mo(4)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-58°. In the third Mo site, Mo(3) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form MoO6 octahedra that share corners with four equivalent Mo(2)O6 octahedra, corners with four equivalent Mo(4)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-58°. In the fourth Mo site, Mo(4) is bonded to one O(1), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(3)O6 octahedra, edges with two equivalent Mo(2)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-58°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Mo(2), and one Mo(4) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Mo(2), and one Mo(3) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mo(2), one Mo(3), and one Mo(4) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Mo(3), and one Mo(4) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Mo(1), one Mo(2), and one Mo(4) atom to form a mixture of distorted corner and edge-sharing OMgMo3 trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mo(1), one Mo(2), and one Mo(3) atom. In the seventh O site, O(7) is bonded to one Mg(1), one Mo(2), one Mo(3), and one Mo(4) atom to form a mixture of distorted corner and edge-sharing OMgMo3 trigonal pyramids. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mo(1), one Mo(3), and one Mo(4) atom.
Mg(MoO2)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form MgO6 octahedra that share corners with two equivalent Mo(2)O6 octahedra, corners with two equivalent Mo(4)O6 octahedra, edges with two equivalent Mo(1)O6 octahedra, edges with two equivalent Mo(3)O6 octahedra,  a faceface with one Mo(2)O6 octahedra, and  a faceface with one Mo(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-48°. The Mg(1)-O(1) bond length is 2.15 Å. The Mg(1)-O(2) bond length is 1.96 Å. The Mg(1)-O(3) bond length is 2.15 Å. The Mg(1)-O(4) bond length is 1.96 Å. The Mg(1)-O(5) bond length is 2.14 Å. The Mg(1)-O(7) bond length is 2.14 Å. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(8) atom to form MoO6 octahedra that share corners with four equivalent Mo(2)O6 octahedra, corners with four equivalent Mo(4)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mo(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-58°. The Mo(1)-O(1) bond length is 2.20 Å. The Mo(1)-O(2) bond length is 2.17 Å. The Mo(1)-O(4) bond length is 2.17 Å. The Mo(1)-O(5) bond length is 2.23 Å. The Mo(1)-O(6) bond length is 2.11 Å. The Mo(1)-O(8) bond length is 2.11 Å. In the second Mo site, Mo(2) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(3)O6 octahedra, edges with two equivalent Mo(4)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-58°. The Mo(2)-O(1) bond length is 2.20 Å. The Mo(2)-O(2) bond length is 2.21 Å. The Mo(2)-O(3) bond length is 2.10 Å. The Mo(2)-O(5) bond length is 2.14 Å. The Mo(2)-O(6) bond length is 1.96 Å. The Mo(2)-O(7) bond length is 2.14 Å. In the third Mo site, Mo(3) is bonded to one O(2), one O(3), one O(4), one O(6), one O(7), and one O(8) atom to form MoO6 octahedra that share corners with four equivalent Mo(2)O6 octahedra, corners with four equivalent Mo(4)O6 octahedra, edges with two equivalent Mg(1)O6 octahedra, and edges with two equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-58°. The Mo(3)-O(2) bond length is 2.17 Å. The Mo(3)-O(3) bond length is 2.20 Å. The Mo(3)-O(4) bond length is 2.17 Å. The Mo(3)-O(6) bond length is 2.12 Å. The Mo(3)-O(7) bond length is 2.23 Å. The Mo(3)-O(8) bond length is 2.11 Å. In the fourth Mo site, Mo(4) is bonded to one O(1), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form MoO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with four equivalent Mo(1)O6 octahedra, corners with four equivalent Mo(3)O6 octahedra, edges with two equivalent Mo(2)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-58°. The Mo(4)-O(1) bond length is 2.10 Å. The Mo(4)-O(3) bond length is 2.20 Å. The Mo(4)-O(4) bond length is 2.21 Å. The Mo(4)-O(5) bond length is 2.14 Å. The Mo(4)-O(7) bond length is 2.14 Å. The Mo(4)-O(8) bond length is 1.96 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Mo(2), and one Mo(4) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Mo(2), and one Mo(3) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mo(2), one Mo(3), and one Mo(4) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(1), one Mo(1), one Mo(3), and one Mo(4) atom. In the fifth O site, O(5) is bonded to one Mg(1), one Mo(1), one Mo(2), and one Mo(4) atom to form a mixture of distorted corner and edge-sharing OMgMo3 trigonal pyramids. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mo(1), one Mo(2), and one Mo(3) atom. In the seventh O site, O(7) is bonded to one Mg(1), one Mo(2), one Mo(3), and one Mo(4) atom to form a mixture of distorted corner and edge-sharing OMgMo3 trigonal pyramids. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mo(1), one Mo(3), and one Mo(4) atom.