Sm(PO3)3 crystallizes in the orthorhombic C222_1 space group. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(1) 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 two equivalent O(1) and two equivalent O(4) atoms to form corner-sharing PO4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Sm(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent P(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to one Sm(1) and one P(1) 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 bent 150 degrees geometry to one Sm(1) and one P(1) atom.
Sm(PO3)3 crystallizes in the orthorhombic C222_1 space group. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), and four equivalent O(1) atoms. Both Sm(1)-O(3) bond lengths are 2.34 Å. Both Sm(1)-O(5) bond lengths are 2.35 Å. There are two shorter (2.41 Å) and two longer (2.65 Å) Sm(1)-O(1) bond lengths. 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 1.59 Å. The P(1)-O(3) bond length is 1.47 Å. The P(1)-O(4) bond length is 1.60 Å. The P(1)-O(5) bond length is 1.48 Å. In the second P site, P(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form corner-sharing PO4 tetrahedra. Both P(2)-O(1) bond lengths are 1.50 Å. Both P(2)-O(4) bond lengths are 1.57 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Sm(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent P(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to one Sm(1) and one P(1) 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 bent 150 degrees geometry to one Sm(1) and one P(1) atom.