Ca(ZnGe)2 crystallizes in the tetragonal I4/mmm space group. Ca(1) is bonded in a 16-coordinate geometry to eight equivalent Zn(1) and eight equivalent Ge(1) atoms. Zn(1) is bonded to four equivalent Ca(1) and four equivalent Ge(1) atoms to form a mixture of distorted face, corner, and edge-sharing ZnCa4Ge4 tetrahedra. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), four equivalent Zn(1), and one Ge(1) atom.
Ca(ZnGe)2 crystallizes in the tetragonal I4/mmm space group. Ca(1) is bonded in a 16-coordinate geometry to eight equivalent Zn(1) and eight equivalent Ge(1) atoms. All Ca(1)-Zn(1) bond lengths are 3.40 Å. All Ca(1)-Ge(1) bond lengths are 3.26 Å. Zn(1) is bonded to four equivalent Ca(1) and four equivalent Ge(1) atoms to form a mixture of distorted face, corner, and edge-sharing ZnCa4Ge4 tetrahedra. All Zn(1)-Ge(1) bond lengths are 2.55 Å. Ge(1) is bonded in a 9-coordinate geometry to four equivalent Ca(1), four equivalent Zn(1), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 2.49 Å.