WFeP2O8 crystallizes in the monoclinic P2_1/m space group. W(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form WO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-54°. Fe(1) is bonded to one O(2), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form distorted FeO6 octahedra that share corners with four equivalent W(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-54°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with three equivalent W(1)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. In the second P site, P(2) is bonded to one O(3), one O(4), and two equivalent O(6) atoms to form PO4 tetrahedra that share  a cornercorner with one W(1)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-61°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one W(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one W(1), one Fe(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one W(1), one Fe(1), and one P(2) atom.
WFeP2O8 crystallizes in the monoclinic P2_1/m space group. W(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form WO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-54°. The W(1)-O(1) bond length is 2.12 Å. The W(1)-O(3) bond length is 2.08 Å. Both W(1)-O(5) bond lengths are 2.06 Å. Both W(1)-O(6) bond lengths are 2.13 Å. Fe(1) is bonded to one O(2), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form distorted FeO6 octahedra that share corners with four equivalent W(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-54°. The Fe(1)-O(2) bond length is 2.02 Å. The Fe(1)-O(4) bond length is 1.99 Å. Both Fe(1)-O(5) bond lengths are 2.40 Å. Both Fe(1)-O(6) bond lengths are 2.22 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), and two equivalent O(5) atoms to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with three equivalent W(1)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-52°. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.51 Å. Both P(1)-O(5) bond lengths are 1.60 Å. In the second P site, P(2) is bonded to one O(3), one O(4), and two equivalent O(6) atoms to form PO4 tetrahedra that share  a cornercorner with one W(1)O6 octahedra, corners with three equivalent Fe(1)O6 octahedra, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-61°. The P(2)-O(3) bond length is 1.53 Å. The P(2)-O(4) bond length is 1.51 Å. Both P(2)-O(6) bond lengths are 1.59 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one W(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one W(1), one Fe(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one W(1), one Fe(1), and one P(2) atom.