Co(GeO3)2 crystallizes in the monoclinic C2/c space group. Co(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form distorted CoO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra and edges with two equivalent Co(1)O6 octahedra. Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with three equivalent Co(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 39-60°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Co(1) and one Ge(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Co(1) and one Ge(1) atom.
Co(GeO3)2 crystallizes in the monoclinic C2/c space group. Co(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form distorted CoO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra and edges with two equivalent Co(1)O6 octahedra. Both Co(1)-O(2) bond lengths are 1.84 Å. There are two shorter (2.03 Å) and two longer (2.14 Å) Co(1)-O(3) bond lengths. Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with three equivalent Co(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 39-60°. The Ge(1)-O(2) bond length is 1.79 Å. The Ge(1)-O(3) bond length is 1.78 Å. There is one shorter (1.75 Å) and one longer (1.76 Å) Ge(1)-O(1) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Co(1) and one Ge(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Co(1) and one Ge(1) atom.