MgV3CoO8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form MgO4 tetrahedra that share corners with two equivalent V(1)O4 tetrahedra, corners with two equivalent V(2)O4 tetrahedra, corners with two equivalent V(3)O4 tetrahedra, and corners with two equivalent Co(1)O4 tetrahedra. There are three inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(3), one O(7), and one O(8) atom to form VO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(3)O4 tetrahedra, and corners with two equivalent Co(1)O4 tetrahedra. In the second V site, V(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form VO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(3)O4 tetrahedra, and corners with two equivalent Co(1)O4 tetrahedra. In the third V site, V(3) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form VO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(1)O4 tetrahedra, and corners with two equivalent V(2)O4 tetrahedra. Co(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form CoO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(1)O4 tetrahedra, and corners with two equivalent V(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1), one V(1), and one Co(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one V(2) and one Co(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mg(1), one V(1), and one V(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one V(2) and one V(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1), one V(2), and one V(3) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mg(1), one V(2), and one Co(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one V(1) and one V(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one V(1) and one Co(1) atom.
MgV3CoO8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form MgO4 tetrahedra that share corners with two equivalent V(1)O4 tetrahedra, corners with two equivalent V(2)O4 tetrahedra, corners with two equivalent V(3)O4 tetrahedra, and corners with two equivalent Co(1)O4 tetrahedra. The Mg(1)-O(1) bond length is 2.01 Å. The Mg(1)-O(3) bond length is 2.02 Å. The Mg(1)-O(5) bond length is 2.00 Å. The Mg(1)-O(6) bond length is 2.00 Å. There are three inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(3), one O(7), and one O(8) atom to form VO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(3)O4 tetrahedra, and corners with two equivalent Co(1)O4 tetrahedra. The V(1)-O(1) bond length is 1.78 Å. The V(1)-O(3) bond length is 1.81 Å. The V(1)-O(7) bond length is 1.74 Å. The V(1)-O(8) bond length is 1.69 Å. In the second V site, V(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form VO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(3)O4 tetrahedra, and corners with two equivalent Co(1)O4 tetrahedra. The V(2)-O(2) bond length is 1.73 Å. The V(2)-O(4) bond length is 1.83 Å. The V(2)-O(5) bond length is 1.93 Å. The V(2)-O(6) bond length is 1.86 Å. In the third V site, V(3) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form VO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(1)O4 tetrahedra, and corners with two equivalent V(2)O4 tetrahedra. The V(3)-O(3) bond length is 2.02 Å. The V(3)-O(4) bond length is 1.83 Å. The V(3)-O(5) bond length is 1.92 Å. The V(3)-O(7) bond length is 1.91 Å. Co(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form CoO4 tetrahedra that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(1)O4 tetrahedra, and corners with two equivalent V(2)O4 tetrahedra. The Co(1)-O(1) bond length is 2.03 Å. The Co(1)-O(2) bond length is 1.91 Å. The Co(1)-O(6) bond length is 1.95 Å. The Co(1)-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 trigonal planar geometry to one Mg(1), one V(1), and one Co(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one V(2) and one Co(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mg(1), one V(1), and one V(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one V(2) and one V(3) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1), one V(2), and one V(3) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mg(1), one V(2), and one Co(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one V(1) and one V(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one V(1) and one Co(1) atom.