WP4O12 crystallizes in the monoclinic P2_1 space group. W(1) is bonded to one O(10), one O(12), one O(6), one O(7), one O(8), and one O(9) atom to form WO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent W(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 range from 43-46°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent W(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 41-46°. In the third P site, P(3) is bonded to one O(10), one O(2), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one W(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 37°. In the fourth P site, P(4) is bonded to one O(1), one O(11), one O(12), and one O(2) atom to form PO4 tetrahedra that share  a cornercorner with one W(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 are 46°. There are twelve 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(4) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one P(3) and one P(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one W(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one W(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one W(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one W(1) and one P(2) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one W(1) and one P(3) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one P(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one W(1) and one P(4) atom.
WP4O12 crystallizes in the monoclinic P2_1 space group. W(1) is bonded to one O(10), one O(12), one O(6), one O(7), one O(8), and one O(9) atom to form WO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The W(1)-O(10) bond length is 1.99 Å. The W(1)-O(12) bond length is 1.97 Å. The W(1)-O(6) bond length is 2.05 Å. The W(1)-O(7) bond length is 2.08 Å. The W(1)-O(8) bond length is 2.04 Å. The W(1)-O(9) bond length is 2.02 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent W(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 range from 43-46°. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.57 Å. The P(1)-O(7) bond length is 1.49 Å. The P(1)-O(8) bond length is 1.50 Å. In the second P site, P(2) is bonded to one O(3), one O(4), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent W(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 41-46°. The P(2)-O(3) bond length is 1.57 Å. The P(2)-O(4) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.49 Å. The P(2)-O(9) bond length is 1.51 Å. In the third P site, P(3) is bonded to one O(10), one O(2), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one W(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 37°. The P(3)-O(10) bond length is 1.53 Å. The P(3)-O(2) bond length is 1.61 Å. The P(3)-O(3) bond length is 1.63 Å. The P(3)-O(5) bond length is 1.44 Å. In the fourth P site, P(4) is bonded to one O(1), one O(11), one O(12), and one O(2) atom to form PO4 tetrahedra that share  a cornercorner with one W(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 are 46°. The P(4)-O(1) bond length is 1.64 Å. The P(4)-O(11) bond length is 1.45 Å. The P(4)-O(12) bond length is 1.54 Å. The P(4)-O(2) bond length is 1.58 Å. There are twelve 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(4) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one P(3) and one P(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one W(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one W(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one W(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one W(1) and one P(2) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one W(1) and one P(3) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one P(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one W(1) and one P(4) atom.