MgCo(ReO4)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with six equivalent Re(1)O4 tetrahedra and faces with two equivalent Co(1)O6 octahedra. Re(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form ReO4 tetrahedra that share corners with three equivalent Mg(1)O6 octahedra and corners with three equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-56°. Co(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form CoO6 octahedra that share corners with six equivalent Re(1)O4 tetrahedra and faces with two equivalent Mg(1)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Re(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Re(1), and one Co(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one Re(1), and one Co(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Re(1), and one Co(1) atom.
MgCo(ReO4)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with six equivalent Re(1)O4 tetrahedra and faces with two equivalent Co(1)O6 octahedra. Both Mg(1)-O(2) bond lengths are 2.17 Å. Both Mg(1)-O(3) bond lengths are 2.17 Å. Both Mg(1)-O(4) bond lengths are 2.15 Å. Re(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form ReO4 tetrahedra that share corners with three equivalent Mg(1)O6 octahedra and corners with three equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-56°. The Re(1)-O(1) bond length is 1.74 Å. The Re(1)-O(2) bond length is 1.81 Å. The Re(1)-O(3) bond length is 1.81 Å. The Re(1)-O(4) bond length is 1.81 Å. Co(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form CoO6 octahedra that share corners with six equivalent Re(1)O4 tetrahedra and faces with two equivalent Mg(1)O6 octahedra. Both Co(1)-O(2) bond lengths are 2.16 Å. Both Co(1)-O(3) bond lengths are 2.11 Å. Both Co(1)-O(4) bond lengths are 2.11 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Re(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Re(1), and one Co(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one Re(1), and one Co(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Re(1), and one Co(1) atom.