Eu2ReO5 crystallizes in the tetragonal P4/n space group. Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), three equivalent O(3), and three equivalent O(4) atoms. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded in a distorted square co-planar geometry to four equivalent O(4) atoms. In the second Re site, Re(2) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with four equivalent O(4)Eu3Re tetrahedra, edges with two equivalent O(2)Eu4 tetrahedra, and edges with four equivalent O(4)Eu3Re tetrahedra. In the second O site, O(2) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with twelve equivalent O(4)Eu3Re tetrahedra and edges with two equivalent O(1)Eu4 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to three equivalent Eu(1) and one Re(2) atom. In the fourth O site, O(4) is bonded to three equivalent Eu(1) and one Re(1) atom to form distorted OEu3Re tetrahedra that share  a cornercorner with one O(1)Eu4 tetrahedra, corners with three equivalent O(4)Eu3Re tetrahedra, corners with three equivalent O(2)Eu4 tetrahedra,  an edgeedge with one O(1)Eu4 tetrahedra, and edges with three equivalent O(4)Eu3Re tetrahedra.
Eu2ReO5 crystallizes in the tetragonal P4/n space group. Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), three equivalent O(3), and three equivalent O(4) atoms. The Eu(1)-O(1) bond length is 2.33 Å. The Eu(1)-O(2) bond length is 2.32 Å. There are a spread of Eu(1)-O(3) bond distances ranging from 2.52-2.70 Å. There are a spread of Eu(1)-O(4) bond distances ranging from 2.53-2.65 Å. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded in a distorted square co-planar geometry to four equivalent O(4) atoms. All Re(1)-O(4) bond lengths are 1.90 Å. In the second Re site, Re(2) is bonded in a distorted square co-planar geometry to four equivalent O(3) atoms. All Re(2)-O(3) bond lengths are 1.89 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with four equivalent O(4)Eu3Re tetrahedra, edges with two equivalent O(2)Eu4 tetrahedra, and edges with four equivalent O(4)Eu3Re tetrahedra. In the second O site, O(2) is bonded to four equivalent Eu(1) atoms to form OEu4 tetrahedra that share corners with twelve equivalent O(4)Eu3Re tetrahedra and edges with two equivalent O(1)Eu4 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to three equivalent Eu(1) and one Re(2) atom. In the fourth O site, O(4) is bonded to three equivalent Eu(1) and one Re(1) atom to form distorted OEu3Re tetrahedra that share  a cornercorner with one O(1)Eu4 tetrahedra, corners with three equivalent O(4)Eu3Re tetrahedra, corners with three equivalent O(2)Eu4 tetrahedra,  an edgeedge with one O(1)Eu4 tetrahedra, and edges with three equivalent O(4)Eu3Re tetrahedra.