LiWP2O7 crystallizes in the monoclinic P2_1 space group. Li(1) is bonded in a see-saw-like geometry to one O(3), one O(5), one O(6), and one O(7) atom. W(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form WO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent W(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-51°. In the second P site, P(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent W(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-50°. There are seven 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 bent 120 degrees geometry to one P(1) and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one W(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one W(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(1), one W(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Li(1), one W(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Li(1), one W(1), and one P(2) atom.
LiWP2O7 crystallizes in the monoclinic P2_1 space group. Li(1) is bonded in a see-saw-like geometry to one O(3), one O(5), one O(6), and one O(7) atom. The Li(1)-O(3) bond length is 2.11 Å. The Li(1)-O(5) bond length is 2.02 Å. The Li(1)-O(6) bond length is 2.15 Å. The Li(1)-O(7) bond length is 2.01 Å. W(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form WO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. The W(1)-O(1) bond length is 2.15 Å. The W(1)-O(3) bond length is 2.16 Å. The W(1)-O(4) bond length is 2.15 Å. The W(1)-O(5) bond length is 2.20 Å. The W(1)-O(6) bond length is 2.17 Å. The W(1)-O(7) bond length is 2.19 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent W(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-51°. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.64 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.52 Å. In the second P site, P(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent W(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 46-50°. The P(2)-O(2) bond length is 1.62 Å. The P(2)-O(5) bond length is 1.54 Å. The P(2)-O(6) bond length is 1.53 Å. The P(2)-O(7) bond length is 1.53 Å. There are seven 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 bent 120 degrees geometry to one P(1) and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one W(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one W(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(1), one W(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Li(1), one W(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Li(1), one W(1), and one P(2) atom.