Na2CrCPO7 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. Cr(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(6) atoms to form CrO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. P(1) is bonded to one O(4), one O(5), and two equivalent O(6) atoms to form PO4 tetrahedra that share corners with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-50°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Cr(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to two equivalent Na(1), one Cr(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Cr(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Cr(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Cr(1), and one P(1) atom.
Na2CrCPO7 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Na(1)-O(1) bond length is 2.27 Å. The Na(1)-O(2) bond length is 2.43 Å. The Na(1)-O(3) bond length is 2.33 Å. The Na(1)-O(4) bond length is 2.45 Å. The Na(1)-O(5) bond length is 2.73 Å. The Na(1)-O(6) bond length is 2.48 Å. Cr(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(6) atoms to form CrO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. The Cr(1)-O(2) bond length is 2.04 Å. The Cr(1)-O(3) bond length is 2.04 Å. The Cr(1)-O(4) bond length is 2.03 Å. The Cr(1)-O(5) bond length is 2.04 Å. Both Cr(1)-O(6) bond lengths are 2.03 Å. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The C(1)-O(1) bond length is 1.25 Å. The C(1)-O(2) bond length is 1.32 Å. The C(1)-O(3) bond length is 1.33 Å. P(1) is bonded to one O(4), one O(5), and two equivalent O(6) atoms to form PO4 tetrahedra that share corners with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-50°. The P(1)-O(4) bond length is 1.56 Å. The P(1)-O(5) bond length is 1.57 Å. Both P(1)-O(6) bond lengths are 1.55 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Cr(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to two equivalent Na(1), one Cr(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(1), one Cr(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Cr(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Cr(1), and one P(1) atom.