Cr(PO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(11), one O(13), one O(16), one O(2), one O(4), and one O(6) atom to form CrO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(6)O4 tetrahedra, and  an edgeedge with one Cr(2)O6 octahedra. In the second Cr site, Cr(2) is bonded to one O(14), one O(16), one O(3), one O(4), one O(7), and one O(8) atom to form CrO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Cr(1)O6 octahedra. There are six inequivalent P sites. In the first P site, P(1) is bonded to one O(12), one O(15), one O(18), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 19°. In the second P site, P(2) is bonded to one O(10), one O(12), one O(13), and one O(14) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(2)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 44-45°. In the third P site, P(3) is bonded to one O(10), one O(17), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-57°. In the fourth P site, P(4) is bonded to one O(1), one O(18), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Cr(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 22-51°. In the fifth P site, P(5) is bonded to one O(11), one O(17), one O(5), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. In the sixth P site, P(6) is bonded to one O(1), one O(16), one O(2), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(2)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-54°. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one P(4) and one P(6) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cr(1) and one P(6) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(2) and one P(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(3) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(5) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Cr(2) and one P(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Cr(2) and one P(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one P(5) and one P(6) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one P(2) and one P(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(5) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Cr(2) and one P(2) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one P(1) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(6) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one P(3) and one P(5) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom.
Cr(PO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(11), one O(13), one O(16), one O(2), one O(4), and one O(6) atom to form CrO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(6)O4 tetrahedra, and  an edgeedge with one Cr(2)O6 octahedra. The Cr(1)-O(11) bond length is 1.94 Å. The Cr(1)-O(13) bond length is 2.01 Å. The Cr(1)-O(16) bond length is 2.22 Å. The Cr(1)-O(2) bond length is 1.99 Å. The Cr(1)-O(4) bond length is 2.16 Å. The Cr(1)-O(6) bond length is 1.95 Å. In the second Cr site, Cr(2) is bonded to one O(14), one O(16), one O(3), one O(4), one O(7), and one O(8) atom to form CrO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Cr(1)O6 octahedra. The Cr(2)-O(14) bond length is 1.97 Å. The Cr(2)-O(16) bond length is 2.11 Å. The Cr(2)-O(3) bond length is 1.99 Å. The Cr(2)-O(4) bond length is 2.10 Å. The Cr(2)-O(7) bond length is 1.96 Å. The Cr(2)-O(8) bond length is 1.98 Å. There are six inequivalent P sites. In the first P site, P(1) is bonded to one O(12), one O(15), one O(18), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles are 19°. The P(1)-O(12) bond length is 1.66 Å. The P(1)-O(15) bond length is 1.45 Å. The P(1)-O(18) bond length is 1.66 Å. The P(1)-O(6) bond length is 1.52 Å. In the second P site, P(2) is bonded to one O(10), one O(12), one O(13), and one O(14) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(2)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 44-45°. The P(2)-O(10) bond length is 1.61 Å. The P(2)-O(12) bond length is 1.57 Å. The P(2)-O(13) bond length is 1.50 Å. The P(2)-O(14) bond length is 1.51 Å. In the third P site, P(3) is bonded to one O(10), one O(17), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 41-57°. The P(3)-O(10) bond length is 1.58 Å. The P(3)-O(17) bond length is 1.57 Å. The P(3)-O(3) bond length is 1.49 Å. The P(3)-O(4) bond length is 1.56 Å. In the fourth P site, P(4) is bonded to one O(1), one O(18), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Cr(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 22-51°. The P(4)-O(1) bond length is 1.64 Å. The P(4)-O(18) bond length is 1.57 Å. The P(4)-O(7) bond length is 1.50 Å. The P(4)-O(8) bond length is 1.50 Å. In the fifth P site, P(5) is bonded to one O(11), one O(17), one O(5), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. The P(5)-O(11) bond length is 1.51 Å. The P(5)-O(17) bond length is 1.65 Å. The P(5)-O(5) bond length is 1.46 Å. The P(5)-O(9) bond length is 1.66 Å. In the sixth P site, P(6) is bonded to one O(1), one O(16), one O(2), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(2)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra, and  a cornercorner with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-54°. The P(6)-O(1) bond length is 1.58 Å. The P(6)-O(16) bond length is 1.55 Å. The P(6)-O(2) bond length is 1.51 Å. The P(6)-O(9) bond length is 1.58 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one P(4) and one P(6) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cr(1) and one P(6) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(2) and one P(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(3) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(5) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Cr(2) and one P(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Cr(2) and one P(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one P(5) and one P(6) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one P(2) and one P(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(5) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Cr(2) and one P(2) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one P(1) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(2), and one P(6) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one P(3) and one P(5) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom.