LiInP2O7 crystallizes in the monoclinic P2_1 space group. Li(1) is bonded in a see-saw-like geometry to one O(1), one O(2), one O(5), and one O(7) atom. In(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form InO6 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(7) atom to form PO4 tetrahedra that share corners with three equivalent In(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-52°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent In(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-52°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Li(1), one In(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one In(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one In(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one In(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one In(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 In(1), and one P(1) atom.
LiInP2O7 crystallizes in the monoclinic P2_1 space group. Li(1) is bonded in a see-saw-like geometry to one O(1), one O(2), one O(5), and one O(7) atom. The Li(1)-O(1) bond length is 2.00 Å. The Li(1)-O(2) bond length is 2.08 Å. The Li(1)-O(5) bond length is 2.07 Å. The Li(1)-O(7) bond length is 2.01 Å. In(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form InO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. The In(1)-O(1) bond length is 2.22 Å. The In(1)-O(2) bond length is 2.19 Å. The In(1)-O(4) bond length is 2.13 Å. The In(1)-O(5) bond length is 2.14 Å. The In(1)-O(6) bond length is 2.12 Å. The In(1)-O(7) bond length is 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), one O(3), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent In(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-52°. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.62 Å. The P(1)-O(7) bond length is 1.53 Å. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent In(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-52°. The P(2)-O(3) bond length is 1.63 Å. The P(2)-O(4) bond length is 1.52 Å. The P(2)-O(5) bond length is 1.53 Å. The P(2)-O(6) bond length is 1.53 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Li(1), one In(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one In(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one In(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one In(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one In(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 In(1), and one P(1) atom.