Sr8RuRh3O16 crystallizes in the tetragonal I-4 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1); four equivalent O(3,4); and four equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(2); two equivalent O(5); and four equivalent O(3,4) atoms. In the third Sr site, Sr(3,4) is bonded in a 7-coordinate geometry to one O(3,4); two equivalent O(1); two equivalent O(2); and two equivalent O(6) atoms. Ru(1) is bonded to two equivalent O(1) and four equivalent O(6) atoms to form RuO6 octahedra that share corners with four equivalent Rh(1)O6 octahedra. The corner-sharing octahedral tilt angles are 22°. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to two equivalent O(2) and four equivalent O(6) atoms to form RhO6 octahedra that share corners with four equivalent Ru(1)O6 octahedra. The corner-sharing octahedral tilt angles are 22°. In the second Rh site, Rh(2,3) is bonded to two equivalent O(3,4) and four equivalent O(5) atoms to form corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles are 23°. There are five inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one Sr(2); two equivalent Sr(1); and two equivalent Rh(2,3) atoms. In the second O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(3,4); one Ru(1); and one Rh(1) atom. In the third O site, O(1) is bonded to one Sr(1); four equivalent Sr(3,4); and one Ru(1) atom to form OSr5Ru octahedra that share corners with five equivalent O(1)Sr5Ru octahedra; edges with four equivalent O(2)Sr5Rh octahedra; and edges with four equivalent O(3,4)Sr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the fourth O site, O(2) is bonded to one Sr(2); four equivalent Sr(3,4); and one Rh(1) atom to form OSr5Rh octahedra that share corners with five equivalent O(2)Sr5Rh octahedra; edges with four equivalent O(3,4)Sr5Rh octahedra; and edges with four equivalent O(1)Sr5Ru octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the fifth O site, O(3,4) is bonded to one Sr(3,4); two equivalent Sr(1); two equivalent Sr(2); and one Rh(2,3) atom to form OSr5Rh octahedra that share corners with five equivalent O(3,4)Sr5Rh octahedra; edges with two equivalent O(2)Sr5Rh octahedra; edges with two equivalent O(1)Sr5Ru octahedra; and edges with four equivalent O(3,4)Sr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-8°.
Sr8RuRh3O16 crystallizes in the tetragonal I-4 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1); four equivalent O(3,4); and four equivalent O(5) atoms. The Sr(1)-O(1) bond length is 2.53 Å. All Sr(1)-O(3,4) bond lengths are 2.77 Å. There are two shorter (2.47 Å) and two longer (3.04 Å) Sr(1)-O(5) bond lengths. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(2); two equivalent O(5); and four equivalent O(3,4) atoms. The Sr(2)-O(2) bond length is 2.48 Å. Both Sr(2)-O(5) bond lengths are 2.48 Å. All Sr(2)-O(3,4) bond lengths are 2.77 Å. In the third Sr site, Sr(3,4) is bonded in a 7-coordinate geometry to one O(3,4); two equivalent O(1); two equivalent O(2); and two equivalent O(6) atoms. The Sr(3,4)-O(3,4) bond length is 2.46 Å. Both Sr(3,4)-O(1) bond lengths are 2.77 Å. Both Sr(3,4)-O(2) bond lengths are 2.77 Å. Both Sr(3,4)-O(6) bond lengths are 2.51 Å. Ru(1) is bonded to two equivalent O(1) and four equivalent O(6) atoms to form RuO6 octahedra that share corners with four equivalent Rh(1)O6 octahedra. The corner-sharing octahedral tilt angles are 22°. Both Ru(1)-O(1) bond lengths are 2.06 Å. All Ru(1)-O(6) bond lengths are 1.96 Å. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded to two equivalent O(2) and four equivalent O(6) atoms to form RhO6 octahedra that share corners with four equivalent Ru(1)O6 octahedra. The corner-sharing octahedral tilt angles are 22°. Both Rh(1)-O(2) bond lengths are 2.11 Å. All Rh(1)-O(6) bond lengths are 2.02 Å. In the second Rh site, Rh(2,3) is bonded to two equivalent O(3,4) and four equivalent O(5) atoms to form corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles are 23°. Both Rh(2,3)-O(3,4) bond lengths are 2.10 Å. All Rh(2,3)-O(5) bond lengths are 2.00 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one Sr(2); two equivalent Sr(1); and two equivalent Rh(2,3) atoms. In the second O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(3,4); one Ru(1); and one Rh(1) atom. In the third O site, O(1) is bonded to one Sr(1); four equivalent Sr(3,4); and one Ru(1) atom to form OSr5Ru octahedra that share corners with five equivalent O(1)Sr5Ru octahedra; edges with four equivalent O(2)Sr5Rh octahedra; and edges with four equivalent O(3,4)Sr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the fourth O site, O(2) is bonded to one Sr(2); four equivalent Sr(3,4); and one Rh(1) atom to form OSr5Rh octahedra that share corners with five equivalent O(2)Sr5Rh octahedra; edges with four equivalent O(3,4)Sr5Rh octahedra; and edges with four equivalent O(1)Sr5Ru octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the fifth O site, O(3,4) is bonded to one Sr(3,4); two equivalent Sr(1); two equivalent Sr(2); and one Rh(2,3) atom to form OSr5Rh octahedra that share corners with five equivalent O(3,4)Sr5Rh octahedra; edges with two equivalent O(2)Sr5Rh octahedra; edges with two equivalent O(1)Sr5Ru octahedra; and edges with four equivalent O(3,4)Sr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-8°.