Sb(PO3)4 crystallizes in the triclinic P-1 space group. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(10), two equivalent O(4), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. In the second Sb site, Sb(2) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(12), one O(3), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra and corners with two equivalent P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the second P site, P(2) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra and corners with two equivalent P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the third P site, P(3) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 25-49°. In the fourth P site, P(4) is bonded to one O(1), one O(10), one O(11), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-48°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one P(1) and one P(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Sb(2) and one P(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one P(2) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(4) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one P(1) atom.
Sb(PO3)4 crystallizes in the triclinic P-1 space group. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(10), two equivalent O(4), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. Both Sb(1)-O(10) bond lengths are 2.34 Å. Both Sb(1)-O(4) bond lengths are 2.25 Å. Both Sb(1)-O(6) bond lengths are 2.29 Å. In the second Sb site, Sb(2) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. Both Sb(2)-O(11) bond lengths are 2.01 Å. Both Sb(2)-O(2) bond lengths are 2.00 Å. Both Sb(2)-O(3) bond lengths are 2.00 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(12), one O(3), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra and corners with two equivalent P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. The P(1)-O(1) bond length is 1.64 Å. The P(1)-O(12) bond length is 1.45 Å. The P(1)-O(3) bond length is 1.58 Å. The P(1)-O(8) bond length is 1.61 Å. In the second P site, P(2) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra and corners with two equivalent P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. The P(2)-O(4) bond length is 1.52 Å. The P(2)-O(5) bond length is 1.68 Å. The P(2)-O(7) bond length is 1.66 Å. The P(2)-O(9) bond length is 1.46 Å. In the third P site, P(3) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 25-49°. The P(3)-O(2) bond length is 1.55 Å. The P(3)-O(5) bond length is 1.58 Å. The P(3)-O(6) bond length is 1.50 Å. The P(3)-O(7) bond length is 1.58 Å. In the fourth P site, P(4) is bonded to one O(1), one O(10), one O(11), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra, and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 32-48°. The P(4)-O(1) bond length is 1.59 Å. The P(4)-O(10) bond length is 1.48 Å. The P(4)-O(11) bond length is 1.55 Å. The P(4)-O(8) bond length is 1.59 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one P(1) and one P(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Sb(2) and one P(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one P(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one P(2) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Sb(2) and one P(4) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one P(1) atom.