Sn2(PO3)5 crystallizes in the monoclinic Pc space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(13), one O(14), one O(15), one O(5), and one O(6) atom to form distorted SnO5 square pyramids that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(5)O4 tetrahedra. In the second Sn site, Sn(2) is bonded in a 3-coordinate geometry to one O(1), one O(11), and one O(2) atom. There are five inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. In the third P site, P(3) is bonded to one O(11), one O(5), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. In the fourth P site, P(4) is bonded to one O(10), one O(12), one O(13), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O5 square pyramid,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. In the fifth P site, P(5) is bonded to one O(12), one O(14), one O(15), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O5 square pyramids,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sn(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Sn(2) and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one P(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(4) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one P(3) and one P(5) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Sn(2) and one P(3) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one P(4) and one P(5) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(5) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(5) atom.
Sn2(PO3)5 crystallizes in the monoclinic Pc space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(13), one O(14), one O(15), one O(5), and one O(6) atom to form distorted SnO5 square pyramids that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(5)O4 tetrahedra. The Sn(1)-O(13) bond length is 2.19 Å. The Sn(1)-O(14) bond length is 2.16 Å. The Sn(1)-O(15) bond length is 2.23 Å. The Sn(1)-O(5) bond length is 2.24 Å. The Sn(1)-O(6) bond length is 2.30 Å. In the second Sn site, Sn(2) is bonded in a 3-coordinate geometry to one O(1), one O(11), and one O(2) atom. The Sn(2)-O(1) bond length is 2.22 Å. The Sn(2)-O(11) bond length is 2.25 Å. The Sn(2)-O(2) bond length is 2.25 Å. There are five inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form corner-sharing PO4 tetrahedra. The P(1)-O(1) bond length is 1.50 Å. The P(1)-O(2) bond length is 1.50 Å. The P(1)-O(4) bond length is 1.61 Å. The P(1)-O(7) bond length is 1.62 Å. In the second P site, P(2) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The P(2)-O(3) bond length is 1.51 Å. The P(2)-O(4) bond length is 1.60 Å. The P(2)-O(6) bond length is 1.52 Å. The P(2)-O(8) bond length is 1.62 Å. In the third P site, P(3) is bonded to one O(11), one O(5), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The P(3)-O(11) bond length is 1.50 Å. The P(3)-O(5) bond length is 1.51 Å. The P(3)-O(7) bond length is 1.61 Å. The P(3)-O(9) bond length is 1.62 Å. In the fourth P site, P(4) is bonded to one O(10), one O(12), one O(13), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sn(1)O5 square pyramid,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The P(4)-O(10) bond length is 1.49 Å. The P(4)-O(12) bond length is 1.62 Å. The P(4)-O(13) bond length is 1.52 Å. The P(4)-O(8) bond length is 1.61 Å. In the fifth P site, P(5) is bonded to one O(12), one O(14), one O(15), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sn(1)O5 square pyramids,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The P(5)-O(12) bond length is 1.61 Å. The P(5)-O(14) bond length is 1.51 Å. The P(5)-O(15) bond length is 1.51 Å. The P(5)-O(9) bond length is 1.60 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sn(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Sn(2) and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one P(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(4) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one P(3) and one P(5) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Sn(2) and one P(3) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one P(4) and one P(5) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(5) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(5) atom.