Sn2P2O7 crystallizes in the monoclinic P2_1/c space group. Sn(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing PO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent P(1) atoms.
Sn2P2O7 crystallizes in the monoclinic P2_1/c space group. Sn(1) is bonded in a 3-coordinate geometry to one O(1), one O(2), and one O(3) atom. The Sn(1)-O(1) bond length is 2.22 Å. The Sn(1)-O(2) bond length is 2.18 Å. The Sn(1)-O(3) bond length is 2.11 Å. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing PO4 tetrahedra. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(3) bond length is 1.51 Å. The P(1)-O(4) bond length is 1.58 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent P(1) atoms.