Y6N2O5 crystallizes in the monoclinic C2/m space group. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one N(1), one O(1), one O(2), and three equivalent O(3) atoms to form YNO5 octahedra that share  a cornercorner with one Y(2)N2O4 octahedra, corners with two equivalent Y(3)N3O3 octahedra, corners with three equivalent Y(1)NO5 octahedra, edges with two equivalent Y(1)NO5 octahedra, edges with three equivalent Y(3)N3O3 octahedra, and edges with four equivalent Y(2)N2O4 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. In the second Y site, Y(2) is bonded to two equivalent N(1), one O(2), one O(3), and two equivalent O(1) atoms to form YN2O4 octahedra that share  a cornercorner with one Y(3)N3O3 octahedra,  a cornercorner with one Y(1)NO5 octahedra, corners with three equivalent Y(2)N2O4 octahedra,  an edgeedge with one Y(2)N2O4 octahedra, edges with four equivalent Y(1)NO5 octahedra, and edges with five equivalent Y(3)N3O3 octahedra. The corner-sharing octahedral tilt angles range from 0-9°. In the third Y site, Y(3) is bonded to three equivalent N(1), one O(3), and two equivalent O(1) atoms to form YN3O3 octahedra that share  a cornercorner with one Y(2)N2O4 octahedra, corners with two equivalent Y(3)N3O3 octahedra, corners with two equivalent Y(1)NO5 octahedra, edges with three equivalent Y(3)N3O3 octahedra, edges with three equivalent Y(1)NO5 octahedra, and edges with five equivalent Y(2)N2O4 octahedra. The corner-sharing octahedral tilt angles range from 1-7°. N(1) is bonded to one Y(1), two equivalent Y(2), and three equivalent Y(3) atoms to form NY6 octahedra that share corners with two equivalent N(1)Y6 octahedra,  a cornercorner with one O(1)Y5 square pyramid, corners with two equivalent O(3)Y5 square pyramids, edges with three equivalent N(1)Y6 octahedra, edges with three equivalent O(3)Y5 square pyramids, and edges with five equivalent O(1)Y5 square pyramids. The corner-sharing octahedral tilt angles are 2°. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), two equivalent Y(2), and two equivalent Y(3) atoms to form OY5 square pyramids that share  a cornercorner with one N(1)Y6 octahedra, corners with two equivalent O(1)Y5 square pyramids, corners with three equivalent O(3)Y5 square pyramids, edges with five equivalent N(1)Y6 octahedra,  an edgeedge with one O(1)Y5 square pyramid, and edges with two equivalent O(3)Y5 square pyramids. The corner-sharing octahedral tilt angles are 6°. In the second O site, O(2) is bonded in a square co-planar geometry to two equivalent Y(1) and two equivalent Y(2) atoms. In the third O site, O(3) is bonded to one Y(2), one Y(3), and three equivalent Y(1) atoms to form OY5 square pyramids that share corners with two equivalent N(1)Y6 octahedra, corners with two equivalent O(3)Y5 square pyramids, corners with three equivalent O(1)Y5 square pyramids, edges with three equivalent N(1)Y6 octahedra, edges with two equivalent O(1)Y5 square pyramids, and edges with two equivalent O(3)Y5 square pyramids. The corner-sharing octahedral tilt angles range from 0-1°.
Y6N2O5 crystallizes in the monoclinic C2/m space group. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded to one N(1), one O(1), one O(2), and three equivalent O(3) atoms to form YNO5 octahedra that share  a cornercorner with one Y(2)N2O4 octahedra, corners with two equivalent Y(3)N3O3 octahedra, corners with three equivalent Y(1)NO5 octahedra, edges with two equivalent Y(1)NO5 octahedra, edges with three equivalent Y(3)N3O3 octahedra, and edges with four equivalent Y(2)N2O4 octahedra. The corner-sharing octahedral tilt angles range from 0-10°. The Y(1)-N(1) bond length is 2.39 Å. The Y(1)-O(1) bond length is 2.44 Å. The Y(1)-O(2) bond length is 2.36 Å. There is one shorter (2.36 Å) and two longer (2.40 Å) Y(1)-O(3) bond lengths. In the second Y site, Y(2) is bonded to two equivalent N(1), one O(2), one O(3), and two equivalent O(1) atoms to form YN2O4 octahedra that share  a cornercorner with one Y(3)N3O3 octahedra,  a cornercorner with one Y(1)NO5 octahedra, corners with three equivalent Y(2)N2O4 octahedra,  an edgeedge with one Y(2)N2O4 octahedra, edges with four equivalent Y(1)NO5 octahedra, and edges with five equivalent Y(3)N3O3 octahedra. The corner-sharing octahedral tilt angles range from 0-9°. There is one shorter (2.36 Å) and one longer (2.48 Å) Y(2)-N(1) bond length. The Y(2)-O(2) bond length is 2.37 Å. The Y(2)-O(3) bond length is 2.33 Å. Both Y(2)-O(1) bond lengths are 2.40 Å. In the third Y site, Y(3) is bonded to three equivalent N(1), one O(3), and two equivalent O(1) atoms to form YN3O3 octahedra that share  a cornercorner with one Y(2)N2O4 octahedra, corners with two equivalent Y(3)N3O3 octahedra, corners with two equivalent Y(1)NO5 octahedra, edges with three equivalent Y(3)N3O3 octahedra, edges with three equivalent Y(1)NO5 octahedra, and edges with five equivalent Y(2)N2O4 octahedra. The corner-sharing octahedral tilt angles range from 1-7°. There are two shorter (2.39 Å) and one longer (2.42 Å) Y(3)-N(1) bond length. The Y(3)-O(3) bond length is 2.42 Å. There is one shorter (2.34 Å) and one longer (2.49 Å) Y(3)-O(1) bond length. N(1) is bonded to one Y(1), two equivalent Y(2), and three equivalent Y(3) atoms to form NY6 octahedra that share corners with two equivalent N(1)Y6 octahedra,  a cornercorner with one O(1)Y5 square pyramid, corners with two equivalent O(3)Y5 square pyramids, edges with three equivalent N(1)Y6 octahedra, edges with three equivalent O(3)Y5 square pyramids, and edges with five equivalent O(1)Y5 square pyramids. The corner-sharing octahedral tilt angles are 2°. There are three inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), two equivalent Y(2), and two equivalent Y(3) atoms to form OY5 square pyramids that share  a cornercorner with one N(1)Y6 octahedra, corners with two equivalent O(1)Y5 square pyramids, corners with three equivalent O(3)Y5 square pyramids, edges with five equivalent N(1)Y6 octahedra,  an edgeedge with one O(1)Y5 square pyramid, and edges with two equivalent O(3)Y5 square pyramids. The corner-sharing octahedral tilt angles are 6°. In the second O site, O(2) is bonded in a square co-planar geometry to two equivalent Y(1) and two equivalent Y(2) atoms. In the third O site, O(3) is bonded to one Y(2), one Y(3), and three equivalent Y(1) atoms to form OY5 square pyramids that share corners with two equivalent N(1)Y6 octahedra, corners with two equivalent O(3)Y5 square pyramids, corners with three equivalent O(1)Y5 square pyramids, edges with three equivalent N(1)Y6 octahedra, edges with two equivalent O(1)Y5 square pyramids, and edges with two equivalent O(3)Y5 square pyramids. The corner-sharing octahedral tilt angles range from 0-1°.