Re2O9 is Indium-like structured and crystallizes in the monoclinic P2_1/m space group. The structure is zero-dimensional and consists of two Re2O9 clusters. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(4), and two equivalent O(6) atoms. In the second Re site, Re(2) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(5) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Re(1) and one Re(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Re(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Re(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Re(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Re(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one Re(1) atom.
Re2O9 is Indium-like structured and crystallizes in the monoclinic P2_1/m space group. The structure is zero-dimensional and consists of two Re2O9 clusters. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(4), and two equivalent O(6) atoms. The Re(1)-O(1) bond length is 2.13 Å. The Re(1)-O(3) bond length is 1.75 Å. Both Re(1)-O(4) bond lengths are 1.75 Å. Both Re(1)-O(6) bond lengths are 2.11 Å. In the second Re site, Re(2) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(5) atoms. The Re(2)-O(1) bond length is 1.82 Å. The Re(2)-O(2) bond length is 1.74 Å. Both Re(2)-O(5) bond lengths are 1.74 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Re(1) and one Re(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Re(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Re(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Re(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Re(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one Re(1) atom.