Sm2RuO5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form distorted SmO7 hexagonal pyramids that share corners with three equivalent Ru(1)O5 trigonal bipyramids, edges with two equivalent Sm(1)O7 hexagonal pyramids, and edges with two equivalent Ru(1)O5 trigonal bipyramids. In the second Sm site, Sm(2) is bonded in a distorted body-centered cubic geometry to one O(3), one O(4), one O(5), two equivalent O(2), and three equivalent O(1) atoms. Ru(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form RuO5 trigonal bipyramids that share corners with three equivalent Sm(1)O7 hexagonal pyramids, corners with two equivalent Ru(1)O5 trigonal bipyramids, and edges with two equivalent Sm(1)O7 hexagonal pyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1) and three equivalent Sm(2) atoms to form OSm4 tetrahedra that share corners with two equivalent O(5)Sm2Ru2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra, corners with five equivalent O(2)Sm3Ru tetrahedra, corners with five equivalent O(3)Sm3Ru tetrahedra,  an edgeedge with one O(5)Sm2Ru2 tetrahedra,  an edgeedge with one O(2)Sm3Ru tetrahedra, and edges with two equivalent O(1)Sm4 tetrahedra. In the second O site, O(2) is bonded to one Sm(1), two equivalent Sm(2), and one Ru(1) atom to form OSm3Ru tetrahedra that share  a cornercorner with one O(5)Sm2Ru2 tetrahedra,  a cornercorner with one O(3)Sm3Ru tetrahedra, corners with two equivalent O(2)Sm3Ru tetrahedra, corners with five equivalent O(1)Sm4 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, edges with two equivalent O(5)Sm2Ru2 tetrahedra, and edges with two equivalent O(3)Sm3Ru tetrahedra. In the third O site, O(3) is bonded to one Sm(2), two equivalent Sm(1), and one Ru(1) atom to form OSm3Ru tetrahedra that share  a cornercorner with one O(5)Sm2Ru2 tetrahedra,  a cornercorner with one O(2)Sm3Ru tetrahedra, corners with two equivalent O(3)Sm3Ru tetrahedra, corners with five equivalent O(1)Sm4 tetrahedra, edges with two equivalent O(5)Sm2Ru2 tetrahedra, and edges with two equivalent O(2)Sm3Ru tetrahedra. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sm(2), two equivalent Sm(1), and one Ru(1) atom. In the fifth O site, O(5) is bonded to one Sm(1), one Sm(2), and two equivalent Ru(1) atoms to form distorted OSm2Ru2 tetrahedra that share  a cornercorner with one O(2)Sm3Ru tetrahedra,  a cornercorner with one O(3)Sm3Ru tetrahedra, corners with two equivalent O(5)Sm2Ru2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, edges with two equivalent O(2)Sm3Ru tetrahedra, and edges with two equivalent O(3)Sm3Ru tetrahedra.
Sm2RuO5 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one O(1), one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms to form distorted SmO7 hexagonal pyramids that share corners with three equivalent Ru(1)O5 trigonal bipyramids, edges with two equivalent Sm(1)O7 hexagonal pyramids, and edges with two equivalent Ru(1)O5 trigonal bipyramids. The Sm(1)-O(1) bond length is 2.32 Å. The Sm(1)-O(2) bond length is 2.46 Å. The Sm(1)-O(5) bond length is 2.44 Å. Both Sm(1)-O(3) bond lengths are 2.37 Å. Both Sm(1)-O(4) bond lengths are 2.45 Å. In the second Sm site, Sm(2) is bonded in a distorted body-centered cubic geometry to one O(3), one O(4), one O(5), two equivalent O(2), and three equivalent O(1) atoms. The Sm(2)-O(3) bond length is 2.38 Å. The Sm(2)-O(4) bond length is 2.96 Å. The Sm(2)-O(5) bond length is 2.48 Å. Both Sm(2)-O(2) bond lengths are 2.51 Å. There are two shorter (2.38 Å) and one longer (2.40 Å) Sm(2)-O(1) bond length. Ru(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form RuO5 trigonal bipyramids that share corners with three equivalent Sm(1)O7 hexagonal pyramids, corners with two equivalent Ru(1)O5 trigonal bipyramids, and edges with two equivalent Sm(1)O7 hexagonal pyramids. The Ru(1)-O(2) bond length is 1.92 Å. The Ru(1)-O(3) bond length is 1.99 Å. The Ru(1)-O(4) bond length is 1.90 Å. Both Ru(1)-O(5) bond lengths are 2.04 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1) and three equivalent Sm(2) atoms to form OSm4 tetrahedra that share corners with two equivalent O(5)Sm2Ru2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra, corners with five equivalent O(2)Sm3Ru tetrahedra, corners with five equivalent O(3)Sm3Ru tetrahedra,  an edgeedge with one O(5)Sm2Ru2 tetrahedra,  an edgeedge with one O(2)Sm3Ru tetrahedra, and edges with two equivalent O(1)Sm4 tetrahedra. In the second O site, O(2) is bonded to one Sm(1), two equivalent Sm(2), and one Ru(1) atom to form OSm3Ru tetrahedra that share  a cornercorner with one O(5)Sm2Ru2 tetrahedra,  a cornercorner with one O(3)Sm3Ru tetrahedra, corners with two equivalent O(2)Sm3Ru tetrahedra, corners with five equivalent O(1)Sm4 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, edges with two equivalent O(5)Sm2Ru2 tetrahedra, and edges with two equivalent O(3)Sm3Ru tetrahedra. In the third O site, O(3) is bonded to one Sm(2), two equivalent Sm(1), and one Ru(1) atom to form OSm3Ru tetrahedra that share  a cornercorner with one O(5)Sm2Ru2 tetrahedra,  a cornercorner with one O(2)Sm3Ru tetrahedra, corners with two equivalent O(3)Sm3Ru tetrahedra, corners with five equivalent O(1)Sm4 tetrahedra, edges with two equivalent O(5)Sm2Ru2 tetrahedra, and edges with two equivalent O(2)Sm3Ru tetrahedra. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sm(2), two equivalent Sm(1), and one Ru(1) atom. In the fifth O site, O(5) is bonded to one Sm(1), one Sm(2), and two equivalent Ru(1) atoms to form distorted OSm2Ru2 tetrahedra that share  a cornercorner with one O(2)Sm3Ru tetrahedra,  a cornercorner with one O(3)Sm3Ru tetrahedra, corners with two equivalent O(5)Sm2Ru2 tetrahedra, corners with two equivalent O(1)Sm4 tetrahedra,  an edgeedge with one O(1)Sm4 tetrahedra, edges with two equivalent O(2)Sm3Ru tetrahedra, and edges with two equivalent O(3)Sm3Ru tetrahedra.