MgCd2(CoO2)4 crystallizes in the tetragonal I-4m2 space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. Co(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2) and three equivalent O(1) atoms. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a tetrahedral geometry to four equivalent O(1) atoms. In the second Cd site, Cd(2) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to three equivalent Co(1) and one Cd(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Co(1), and one Cd(2) atom.
MgCd2(CoO2)4 crystallizes in the tetragonal I-4m2 space group. Mg(1) is bonded in a 4-coordinate geometry to four equivalent O(2) atoms. All Mg(1)-O(2) bond lengths are 1.95 Å. Co(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2) and three equivalent O(1) atoms. The Co(1)-O(2) bond length is 1.83 Å. There is one shorter (1.91 Å) and two longer (2.06 Å) Co(1)-O(1) bond lengths. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a tetrahedral geometry to four equivalent O(1) atoms. All Cd(1)-O(1) bond lengths are 2.31 Å. In the second Cd site, Cd(2) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. All Cd(2)-O(2) bond lengths are 2.21 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to three equivalent Co(1) and one Cd(1) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mg(1), one Co(1), and one Cd(2) atom.