Bi5O7I crystallizes in the orthorhombic Ibca space group. The structure consists of eight hydriodic acid atoms inside a Bi5O7 framework. In the Bi5O7 framework, there are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. In the second Bi site, Bi(2) is bonded in a rectangular see-saw-like geometry to one O(2) and three equivalent O(3) atoms. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(3) atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Bi(2) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Bi(2) atoms. In the fourth O site, O(4) is bonded to four equivalent Bi(1) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra.
Bi5O7I crystallizes in the orthorhombic Ibca space group. The structure consists of eight hydriodic acid atoms inside a Bi5O7 framework. In the Bi5O7 framework, there are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. There is one shorter (2.31 Å) and one longer (2.68 Å) Bi(1)-O(1) bond length. There is one shorter (2.34 Å) and one longer (2.44 Å) Bi(1)-O(2) bond length. There is one shorter (2.18 Å) and one longer (2.39 Å) Bi(1)-O(4) bond length. In the second Bi site, Bi(2) is bonded in a rectangular see-saw-like geometry to one O(2) and three equivalent O(3) atoms. The Bi(2)-O(2) bond length is 2.13 Å. There are two shorter (2.14 Å) and one longer (2.64 Å) Bi(2)-O(3) bond length. In the third Bi site, Bi(3) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. There are two shorter (2.18 Å) and two longer (2.22 Å) Bi(3)-O(1) bond lengths. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Bi(1) and two equivalent Bi(3) atoms to form a mixture of distorted corner and edge-sharing OBi4 tetrahedra. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Bi(2) and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Bi(2) atoms. In the fourth O site, O(4) is bonded to four equivalent Bi(1) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra.