Cr(PO3)3 crystallizes in the monoclinic Cc space group. Cr(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form CrO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 39-41°. In the second P site, P(2) is bonded to one O(2), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 39-41°. In the third P site, P(3) is bonded to one O(1), one O(3), one O(4), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 38-42°. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a bent 150 degrees geometry to one P(2) and one P(3) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the third O site, O(2) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(3) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(3) atom. In the sixth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the seventh O site, O(6) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the eighth O site, O(7) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the ninth O site, O(8) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom.
Cr(PO3)3 crystallizes in the monoclinic Cc space group. Cr(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form CrO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Cr(1)-O(3) bond length is 1.99 Å. The Cr(1)-O(4) bond length is 1.98 Å. The Cr(1)-O(5) bond length is 1.99 Å. The Cr(1)-O(6) bond length is 1.98 Å. The Cr(1)-O(7) bond length is 1.99 Å. The Cr(1)-O(8) bond length is 1.98 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 39-41°. The P(1)-O(1) bond length is 1.60 Å. The P(1)-O(2) bond length is 1.61 Å. The P(1)-O(5) bond length is 1.50 Å. The P(1)-O(6) bond length is 1.50 Å. In the second P site, P(2) is bonded to one O(2), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 39-41°. The P(2)-O(2) bond length is 1.60 Å. The P(2)-O(7) bond length is 1.50 Å. The P(2)-O(8) bond length is 1.50 Å. The P(2)-O(9) bond length is 1.61 Å. In the third P site, P(3) is bonded to one O(1), one O(3), one O(4), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 38-42°. The P(3)-O(1) bond length is 1.61 Å. The P(3)-O(3) bond length is 1.50 Å. The P(3)-O(4) bond length is 1.50 Å. The P(3)-O(9) bond length is 1.60 Å. There are nine inequivalent O sites. In the first O site, O(9) is bonded in a bent 150 degrees geometry to one P(2) and one P(3) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the third O site, O(2) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(3) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(3) atom. In the sixth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the seventh O site, O(6) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the eighth O site, O(7) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the ninth O site, O(8) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom.