ZnSn3(P2O7)2 crystallizes in the monoclinic P2_1/c space group. Zn(1) is bonded in a distorted linear geometry to two equivalent O(2) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(7) atom. In the second Sn site, Sn(2) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(6) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form corner-sharing PO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to one Sn(2) and one P(2) atom. In the third O site, O(7) is bonded in a 2-coordinate geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to one Sn(2) and one P(2) atom. In the fifth O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the sixth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom.
ZnSn3(P2O7)2 crystallizes in the monoclinic P2_1/c space group. Zn(1) is bonded in a distorted linear geometry to two equivalent O(2) atoms. Both Zn(1)-O(2) bond lengths are 1.85 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(7) atom. The Sn(1)-O(3) bond length is 2.26 Å. The Sn(1)-O(5) bond length is 2.18 Å. The Sn(1)-O(7) bond length is 2.14 Å. In the second Sn site, Sn(2) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(6) atoms. Both Sn(2)-O(1) bond lengths are 2.49 Å. Both Sn(2)-O(6) bond lengths are 2.45 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form corner-sharing PO4 tetrahedra. The P(1)-O(2) bond length is 1.56 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.61 Å. The P(1)-O(5) bond length is 1.52 Å. In the second P site, P(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form corner-sharing PO4 tetrahedra. The P(2)-O(1) bond length is 1.53 Å. The P(2)-O(4) bond length is 1.64 Å. The P(2)-O(6) bond length is 1.52 Å. The P(2)-O(7) bond length is 1.57 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to one Sn(2) and one P(2) atom. In the third O site, O(7) is bonded in a 2-coordinate geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(1) is bonded in a distorted single-bond geometry to one Sn(2) and one P(2) atom. In the fifth O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the sixth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom.