InPH2O5 crystallizes in the triclinic P-1 space group. In(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form InO6 octahedra that share corners with five equivalent P(1)O4 tetrahedra and  an edgeedge with one In(1)O6 octahedra. 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 five equivalent In(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-55°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) and one O(5) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) and one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent In(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one In(1), one P(1), and one H(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one In(1), one P(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one In(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one In(1), one H(1), and one H(2) atom.
InPH2O5 crystallizes in the triclinic P-1 space group. In(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form InO6 octahedra that share corners with five equivalent P(1)O4 tetrahedra and  an edgeedge with one In(1)O6 octahedra. The In(1)-O(2) bond length is 2.16 Å. The In(1)-O(3) bond length is 2.17 Å. The In(1)-O(4) bond length is 2.11 Å. The In(1)-O(5) bond length is 2.17 Å. There is one shorter (2.24 Å) and one longer (2.27 Å) In(1)-O(1) bond length. 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 five equivalent In(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-55°. The P(1)-O(1) bond length is 1.59 Å. The P(1)-O(2) bond length is 1.56 Å. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(4) bond length is 1.53 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) and one O(5) atom. The H(1)-O(2) bond length is 1.71 Å. The H(1)-O(5) bond length is 1.00 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) and one O(5) atom. The H(2)-O(3) bond length is 1.72 Å. The H(2)-O(5) bond length is 1.00 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent In(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one In(1), one P(1), and one H(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one In(1), one P(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one In(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one In(1), one H(1), and one H(2) atom.