Ti(PO3)4 crystallizes in the monoclinic C2/c space group. Ti(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form TiO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 26-45°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Ti(1) and one P(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ti(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Ti(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one P(1) atom.
Ti(PO3)4 crystallizes in the monoclinic C2/c space group. Ti(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form TiO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with four equivalent P(2)O4 tetrahedra. Both Ti(1)-O(2) bond lengths are 1.99 Å. Both Ti(1)-O(3) bond lengths are 1.94 Å. Both Ti(1)-O(4) bond lengths are 1.99 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 47°. The P(1)-O(1) bond length is 1.66 Å. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(5) bond length is 1.63 Å. The P(1)-O(6) bond length is 1.45 Å. In the second P site, P(2) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 26-45°. The P(2)-O(1) bond length is 1.59 Å. The P(2)-O(2) bond length is 1.51 Å. The P(2)-O(4) bond length is 1.52 Å. The P(2)-O(5) bond length is 1.59 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Ti(1) and one P(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ti(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Ti(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one P(1) atom.