LiCr4(HgO4)2 crystallizes in the cubic F-43m space group. Li(1) is bonded to four equivalent Cr(1) and four equivalent O(1) atoms to form LiCr4O4 tetrahedra that share corners with four equivalent Hg(1)O4 tetrahedra and corners with twelve equivalent O(2)Cr3Hg tetrahedra. Cr(1) is bonded in a 7-coordinate geometry to one Li(1), three equivalent O(1), and three equivalent O(2) atoms. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to four equivalent O(1) atoms to form HgO4 tetrahedra that share corners with four equivalent Li(1)Cr4O4 tetrahedra. In the second Hg site, Hg(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 distorted single-bond geometry to one Li(1), three equivalent Cr(1), and one Hg(1) atom. In the second O site, O(2) is bonded to three equivalent Cr(1) and one Hg(2) atom to form distorted OCr3Hg tetrahedra that share corners with three equivalent Li(1)Cr4O4 tetrahedra, corners with three equivalent O(2)Cr3Hg tetrahedra, and edges with three equivalent O(2)Cr3Hg tetrahedra.
LiCr4(HgO4)2 crystallizes in the cubic F-43m space group. Li(1) is bonded to four equivalent Cr(1) and four equivalent O(1) atoms to form LiCr4O4 tetrahedra that share corners with four equivalent Hg(1)O4 tetrahedra and corners with twelve equivalent O(2)Cr3Hg tetrahedra. All Li(1)-Cr(1) bond lengths are 2.12 Å. All Li(1)-O(1) bond lengths are 1.69 Å. Cr(1) is bonded in a 7-coordinate geometry to one Li(1), three equivalent O(1), and three equivalent O(2) atoms. All Cr(1)-O(1) bond lengths are 2.23 Å. All Cr(1)-O(2) bond lengths are 2.01 Å. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to four equivalent O(1) atoms to form HgO4 tetrahedra that share corners with four equivalent Li(1)Cr4O4 tetrahedra. All Hg(1)-O(1) bond lengths are 2.28 Å. In the second Hg site, Hg(2) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. All Hg(2)-O(2) bond lengths are 2.36 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Li(1), three equivalent Cr(1), and one Hg(1) atom. In the second O site, O(2) is bonded to three equivalent Cr(1) and one Hg(2) atom to form distorted OCr3Hg tetrahedra that share corners with three equivalent Li(1)Cr4O4 tetrahedra, corners with three equivalent O(2)Cr3Hg tetrahedra, and edges with three equivalent O(2)Cr3Hg tetrahedra.