Co2HgO4 is Spinel structured and crystallizes in the tetragonal I4_1/amd space group. Co(1) is bonded to six equivalent O(1) atoms to form CoO6 octahedra that share corners with six equivalent Hg(1)O4 tetrahedra and edges with six equivalent Co(1)O6 octahedra. Hg(1) is bonded to four equivalent O(1) atoms to form HgO4 tetrahedra that share corners with twelve equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 61-64°. O(1) is bonded to three equivalent Co(1) and one Hg(1) atom to form a mixture of distorted edge and corner-sharing OCo3Hg tetrahedra.
Co2HgO4 is Spinel structured and crystallizes in the tetragonal I4_1/amd space group. Co(1) is bonded to six equivalent O(1) atoms to form CoO6 octahedra that share corners with six equivalent Hg(1)O4 tetrahedra and edges with six equivalent Co(1)O6 octahedra. There are two shorter (1.97 Å) and four longer (2.09 Å) Co(1)-O(1) bond lengths. Hg(1) is bonded to four equivalent O(1) atoms to form HgO4 tetrahedra that share corners with twelve equivalent Co(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 61-64°. All Hg(1)-O(1) bond lengths are 2.22 Å. O(1) is bonded to three equivalent Co(1) and one Hg(1) atom to form a mixture of distorted edge and corner-sharing OCo3Hg tetrahedra.