Rb2Sn3O7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to two equivalent O(3), two equivalent O(6), and three equivalent O(1) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(6), two equivalent O(5), and three equivalent O(7) atoms to form a mixture of corner and edge-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles range from 39-51°. In the second Sn site, Sn(2) is bonded to one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form a mixture of corner and edge-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 51°. In the third Sn site, Sn(3) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form a mixture of corner and edge-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 39°. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Rb(1), one Sn(3), and two equivalent Sn(2) atoms. In the second O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one Sn(2), and two equivalent Sn(1) atoms. In the third O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Rb(2), one Sn(1), and one Sn(3) atom. In the fourth O site, O(7) is bonded in a 5-coordinate geometry to two equivalent Rb(1) and three equivalent Sn(1) atoms. In the fifth O site, O(1) is bonded to three equivalent Rb(2) and two equivalent Sn(3) atoms to form distorted edge-sharing ORb3Sn2 square pyramids. In the sixth O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Rb(1), one Sn(2), and two equivalent Sn(3) atoms. In the seventh O site, O(3) is bonded in a 5-coordinate geometry to one Rb(1), two equivalent Rb(2), and two equivalent Sn(2) atoms.
Rb2Sn3O7 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 8-coordinate geometry to one O(3), one O(5), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. The Rb(1)-O(3) bond length is 2.92 Å. The Rb(1)-O(5) bond length is 3.06 Å. Both Rb(1)-O(2) bond lengths are 2.92 Å. Both Rb(1)-O(4) bond lengths are 2.97 Å. Both Rb(1)-O(7) bond lengths are 3.01 Å. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to two equivalent O(3), two equivalent O(6), and three equivalent O(1) atoms. Both Rb(2)-O(3) bond lengths are 2.82 Å. Both Rb(2)-O(6) bond lengths are 2.94 Å. There is one shorter (2.85 Å) and two longer (3.00 Å) Rb(2)-O(1) bond lengths. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(6), two equivalent O(5), and three equivalent O(7) atoms to form a mixture of corner and edge-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles range from 39-51°. The Sn(1)-O(6) bond length is 2.01 Å. Both Sn(1)-O(5) bond lengths are 2.14 Å. There are two shorter (2.14 Å) and one longer (2.22 Å) Sn(1)-O(7) bond length. In the second Sn site, Sn(2) is bonded to one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form a mixture of corner and edge-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 51°. The Sn(2)-O(2) bond length is 2.13 Å. The Sn(2)-O(5) bond length is 2.14 Å. Both Sn(2)-O(3) bond lengths are 2.08 Å. Both Sn(2)-O(4) bond lengths are 2.16 Å. In the third Sn site, Sn(3) is bonded to one O(4), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form a mixture of corner and edge-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 39°. The Sn(3)-O(4) bond length is 2.27 Å. The Sn(3)-O(6) bond length is 2.05 Å. Both Sn(3)-O(1) bond lengths are 2.09 Å. Both Sn(3)-O(2) bond lengths are 2.17 Å. There are seven inequivalent O sites. In the first O site, O(4) is bonded in a 5-coordinate geometry to two equivalent Rb(1), one Sn(3), and two equivalent Sn(2) atoms. In the second O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one Sn(2), and two equivalent Sn(1) atoms. In the third O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Rb(2), one Sn(1), and one Sn(3) atom. In the fourth O site, O(7) is bonded in a 5-coordinate geometry to two equivalent Rb(1) and three equivalent Sn(1) atoms. In the fifth O site, O(1) is bonded to three equivalent Rb(2) and two equivalent Sn(3) atoms to form distorted edge-sharing ORb3Sn2 square pyramids. In the sixth O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Rb(1), one Sn(2), and two equivalent Sn(3) atoms. In the seventh O site, O(3) is bonded in a 5-coordinate geometry to one Rb(1), two equivalent Rb(2), and two equivalent Sn(2) atoms.