Ca(SnO2)2 crystallizes in the monoclinic C2/m space group. Ca(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted CaO6 octahedra that share corners with three equivalent Sn(1)O6 octahedra, edges with two equivalent Ca(1)O6 octahedra, and edges with three equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-29°. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form SnO6 octahedra that share corners with three equivalent Ca(1)O6 octahedra, edges with three equivalent Ca(1)O6 octahedra, and edges with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-29°. In the second Sn site, Sn(2) is bonded in a 5-coordinate geometry to two equivalent O(2) and three equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Ca(1) and two equivalent Sn(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Sn(1), and two equivalent Sn(2) atoms. In the third O site, O(3) is bonded to two equivalent Ca(1) and three equivalent Sn(1) atoms to form edge-sharing OCa2Sn3 square pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Ca(1) and three equivalent Sn(2) atoms.
Ca(SnO2)2 crystallizes in the monoclinic C2/m space group. Ca(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted CaO6 octahedra that share corners with three equivalent Sn(1)O6 octahedra, edges with two equivalent Ca(1)O6 octahedra, and edges with three equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-29°. The Ca(1)-O(1) bond length is 2.34 Å. The Ca(1)-O(2) bond length is 2.31 Å. Both Ca(1)-O(3) bond lengths are 2.58 Å. Both Ca(1)-O(4) bond lengths are 2.27 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form SnO6 octahedra that share corners with three equivalent Ca(1)O6 octahedra, edges with three equivalent Ca(1)O6 octahedra, and edges with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-29°. The Sn(1)-O(2) bond length is 2.02 Å. Both Sn(1)-O(1) bond lengths are 2.07 Å. There is one shorter (2.23 Å) and two longer (2.28 Å) Sn(1)-O(3) bond lengths. In the second Sn site, Sn(2) is bonded in a 5-coordinate geometry to two equivalent O(2) and three equivalent O(4) atoms. Both Sn(2)-O(2) bond lengths are 2.49 Å. There is one shorter (2.15 Å) and two longer (2.65 Å) Sn(2)-O(4) bond lengths. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Ca(1) and two equivalent Sn(1) atoms. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Sn(1), and two equivalent Sn(2) atoms. In the third O site, O(3) is bonded to two equivalent Ca(1) and three equivalent Sn(1) atoms to form edge-sharing OCa2Sn3 square pyramids. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Ca(1) and three equivalent Sn(2) atoms.