Sr2RhO4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to two equivalent O(3), two equivalent O(4), and three equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to two equivalent O(1,5); two equivalent O(2); and three equivalent O(3) atoms. Rh(1) is bonded to one O(2); one O(3); two equivalent O(1,5); and two equivalent O(4) atoms to form corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles are 23°. There are four inequivalent O sites. In the first O site, O(1,5) is bonded in a 4-coordinate geometry to two equivalent Sr(2) and two equivalent Rh(1) atoms. In the second O site, O(2) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Rh(1) atom to form a mixture of edge and corner-sharing OSr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the third O site, O(3) is bonded to two equivalent Sr(1), three equivalent Sr(2), and one Rh(1) atom to form a mixture of edge and corner-sharing OSr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Rh(1) atoms.
Sr2RhO4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to two equivalent O(3), two equivalent O(4), and three equivalent O(2) atoms. There is one shorter (2.72 Å) and one longer (2.73 Å) Sr(1)-O(3) bond length. There is one shorter (2.46 Å) and one longer (2.47 Å) Sr(1)-O(4) bond length. There are a spread of Sr(1)-O(2) bond distances ranging from 2.49-2.74 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to two equivalent O(1,5); two equivalent O(2); and three equivalent O(3) atoms. Both Sr(2)-O(1,5) bond lengths are 2.47 Å. Both Sr(2)-O(2) bond lengths are 2.73 Å. There is one shorter (2.49 Å) and two longer (2.73 Å) Sr(2)-O(3) bond lengths. Rh(1) is bonded to one O(2); one O(3); two equivalent O(1,5); and two equivalent O(4) atoms to form corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles are 23°. The Rh(1)-O(2) bond length is 2.06 Å. The Rh(1)-O(3) bond length is 2.06 Å. Both Rh(1)-O(1,5) bond lengths are 1.97 Å. Both Rh(1)-O(4) bond lengths are 1.97 Å. There are four inequivalent O sites. In the first O site, O(1,5) is bonded in a 4-coordinate geometry to two equivalent Sr(2) and two equivalent Rh(1) atoms. In the second O site, O(2) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Rh(1) atom to form a mixture of edge and corner-sharing OSr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the third O site, O(3) is bonded to two equivalent Sr(1), three equivalent Sr(2), and one Rh(1) atom to form a mixture of edge and corner-sharing OSr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Rh(1) atoms.