Mg(BiO2)4 crystallizes in the triclinic P1 space group. Mg(1) 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 MgO6 octahedra that share edges with two equivalent Bi(3)O6 octahedra and edges with two equivalent Bi(4)O6 octahedra. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. In the third Bi site, Bi(3) 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 BiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra and edges with two equivalent Bi(4)O6 octahedra. In the fourth Bi site, Bi(4) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form BiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra and edges with two equivalent Bi(3)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Bi(1), one Bi(2), and one Bi(3) atom to form a mixture of distorted corner and edge-sharing OMgBi3 trigonal pyramids. In the second O site, O(2) is bonded in a trigonal planar geometry to one Bi(2), one Bi(3), and one Bi(4) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Bi(1), one Bi(2), and one Bi(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Mg(1), one Bi(2), one Bi(3), and one Bi(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one Bi(1), one Bi(3), and one Bi(4) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Bi(1), one Bi(3), and one Bi(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Bi(1), one Bi(2), and one Bi(4) atom. In the eighth O site, O(8) is bonded to one Mg(1), one Bi(1), one Bi(2), and one Bi(3) atom to form a mixture of distorted corner and edge-sharing OMgBi3 trigonal pyramids.
Mg(BiO2)4 crystallizes in the triclinic P1 space group. Mg(1) 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 MgO6 octahedra that share edges with two equivalent Bi(3)O6 octahedra and edges with two equivalent Bi(4)O6 octahedra. The Mg(1)-O(1) bond length is 2.16 Å. The Mg(1)-O(3) bond length is 2.14 Å. The Mg(1)-O(4) bond length is 2.10 Å. The Mg(1)-O(5) bond length is 2.10 Å. The Mg(1)-O(7) bond length is 2.13 Å. The Mg(1)-O(8) bond length is 2.15 Å. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom. The Bi(1)-O(1) bond length is 2.29 Å. The Bi(1)-O(3) bond length is 2.44 Å. The Bi(1)-O(5) bond length is 2.74 Å. The Bi(1)-O(6) bond length is 2.20 Å. The Bi(1)-O(7) bond length is 2.61 Å. The Bi(1)-O(8) bond length is 2.30 Å. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. The Bi(2)-O(1) bond length is 2.31 Å. The Bi(2)-O(2) bond length is 2.20 Å. The Bi(2)-O(3) bond length is 2.60 Å. The Bi(2)-O(4) bond length is 2.72 Å. The Bi(2)-O(7) bond length is 2.43 Å. The Bi(2)-O(8) bond length is 2.30 Å. In the third Bi site, Bi(3) 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 BiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra and edges with two equivalent Bi(4)O6 octahedra. The Bi(3)-O(1) bond length is 2.38 Å. The Bi(3)-O(2) bond length is 2.38 Å. The Bi(3)-O(4) bond length is 2.42 Å. The Bi(3)-O(5) bond length is 2.39 Å. The Bi(3)-O(6) bond length is 2.37 Å. The Bi(3)-O(8) bond length is 2.36 Å. In the fourth Bi site, Bi(4) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form BiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra and edges with two equivalent Bi(3)O6 octahedra. The Bi(4)-O(2) bond length is 2.21 Å. The Bi(4)-O(3) bond length is 2.18 Å. The Bi(4)-O(4) bond length is 2.18 Å. The Bi(4)-O(5) bond length is 2.19 Å. The Bi(4)-O(6) bond length is 2.20 Å. The Bi(4)-O(7) bond length is 2.18 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one Bi(1), one Bi(2), and one Bi(3) atom to form a mixture of distorted corner and edge-sharing OMgBi3 trigonal pyramids. In the second O site, O(2) is bonded in a trigonal planar geometry to one Bi(2), one Bi(3), and one Bi(4) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Bi(1), one Bi(2), and one Bi(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Mg(1), one Bi(2), one Bi(3), and one Bi(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Mg(1), one Bi(1), one Bi(3), and one Bi(4) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Bi(1), one Bi(3), and one Bi(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Bi(1), one Bi(2), and one Bi(4) atom. In the eighth O site, O(8) is bonded to one Mg(1), one Bi(1), one Bi(2), and one Bi(3) atom to form a mixture of distorted corner and edge-sharing OMgBi3 trigonal pyramids.