(Sb3O11)2(O2)3 crystallizes in the monoclinic P2_1/m space group. The structure consists of two hydrogen peroxide molecules and two water atoms inside a Sb3O11 framework. In the Sb3O11 framework, there are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms to form corner-sharing SbO6 octahedra. In the second Sb site, Sb(2) is bonded to one O(3), one O(4), one O(5), and two equivalent O(6) atoms to form SbO5 trigonal bipyramids that share corners with three equivalent Sb(1)O6 octahedra and  an edgeedge with one Sb(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 45-64°. There are six inequivalent O sites. In the first O site, O(2) is bonded in a water-like geometry to two equivalent O(5) atoms. In the second O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one Sb(2) atom. In the third O site, O(4) is bonded in a single-bond geometry to one Sb(2) atom. In the fourth O site, O(5) is bonded in a water-like geometry to one Sb(2) and one O(2) atom. In the fifth O site, O(6) is bonded in a distorted trigonal planar geometry to one Sb(1) and two equivalent Sb(2) atoms. In the sixth O site, O(7) is bonded in a single-bond geometry to one Sb(1) atom.
(Sb3O11)2(O2)3 crystallizes in the monoclinic P2_1/m space group. The structure consists of two hydrogen peroxide molecules and two water atoms inside a Sb3O11 framework. In the Sb3O11 framework, there are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to two equivalent O(3), two equivalent O(6), and two equivalent O(7) atoms to form corner-sharing SbO6 octahedra. Both Sb(1)-O(3) bond lengths are 2.04 Å. Both Sb(1)-O(6) bond lengths are 2.22 Å. Both Sb(1)-O(7) bond lengths are 1.93 Å. In the second Sb site, Sb(2) is bonded to one O(3), one O(4), one O(5), and two equivalent O(6) atoms to form SbO5 trigonal bipyramids that share corners with three equivalent Sb(1)O6 octahedra and  an edgeedge with one Sb(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 45-64°. The Sb(2)-O(3) bond length is 1.92 Å. The Sb(2)-O(4) bond length is 1.89 Å. The Sb(2)-O(5) bond length is 2.16 Å. There is one shorter (2.03 Å) and one longer (2.14 Å) Sb(2)-O(6) bond length. There are six inequivalent O sites. In the first O site, O(2) is bonded in a water-like geometry to two equivalent O(5) atoms. Both O(2)-O(5) bond lengths are 1.40 Å. In the second O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sb(1) and one Sb(2) atom. In the third O site, O(4) is bonded in a single-bond geometry to one Sb(2) atom. In the fourth O site, O(5) is bonded in a water-like geometry to one Sb(2) and one O(2) atom. In the fifth O site, O(6) is bonded in a distorted trigonal planar geometry to one Sb(1) and two equivalent Sb(2) atoms. In the sixth O site, O(7) is bonded in a single-bond geometry to one Sb(1) atom.