Re3O8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing ReO6 octahedra. The corner-sharing octahedral tilt angles range from 39-44°. In the second Re site, Re(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form a mixture of corner and edge-sharing ReO6 octahedra. The corner-sharing octahedral tilt angles range from 39-44°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Re(1) and two equivalent Re(2) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Re(1) and one Re(2) atom. In the third O site, O(3) is bonded in an L-shaped geometry to two equivalent Re(2) atoms.
Re3O8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing ReO6 octahedra. The corner-sharing octahedral tilt angles range from 39-44°. Both Re(1)-O(1) bond lengths are 2.00 Å. All Re(1)-O(2) bond lengths are 1.90 Å. In the second Re site, Re(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form a mixture of corner and edge-sharing ReO6 octahedra. The corner-sharing octahedral tilt angles range from 39-44°. Both Re(2)-O(1) bond lengths are 2.06 Å. Both Re(2)-O(2) bond lengths are 1.90 Å. Both Re(2)-O(3) bond lengths are 1.96 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Re(1) and two equivalent Re(2) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Re(1) and one Re(2) atom. In the third O site, O(3) is bonded in an L-shaped geometry to two equivalent Re(2) atoms.