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RhO2 is Hydrophilite-like structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Rh4+ is bonded to six equivalent O2- atoms to form a mixture of corner and edge-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles are 52°. There is two shorter (1.98 Å) and four longer (2.00 Å) Rh–O bond length. O2- is bonded in a trigonal planar geometry to three equivalent Rh4+ atoms.
Ni(RhO2)2 is Spinel structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Rh3+ is bonded to six equivalent O2- atoms to form RhO6 octahedra that share corners with six equivalent NiO4 tetrahedra and edges with six equivalent RhO6 octahedra. There are two shorter (2.07 Å) and four longer (2.08 Å) Rh–O bond lengths. Ni2+ is bonded to four equivalent O2- atoms to form NiO4 tetrahedra that share corners with twelve equivalent RhO6 octahedra. The corner-sharing octahedra tilt angles range from 52–61°. All Ni–O bond lengths are 2.01 Å. O2- is bonded in a rectangular see-saw-like geometry to three equivalent Rh3+ and one Ni2+ atom.
Na3Cd(RhO2)8 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.42–2.64 Å. In the second Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.41–2.55 Å. In the third Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.41–2.58 Å. There are eight inequivalent Rh+3.38+ sites. In the first Rh+3.38+ site, Rh+3.38+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–59°. There are a spread of Rh–O bond distances ranging from 2.02–2.07 Å. In the second Rh+3.38+ site, Rh+3.38+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–59°. There are a spread of Rh–O bond distances ranging from 2.02–2.12 Å. In the third Rh+3.38+ site, Rh+3.38+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–60°. There are a spread of Rh–O bond distances ranging from 2.04–2.11 Å. In the fourth Rh+3.38+ site, Rh+3.38+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–60°. There are a spread of Rh–O bond distances ranging from 2.04–2.07 Å. In the fifth Rh+3.38+ site, Rh+3.38+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–60°. There are a spread of Rh–O bond distances ranging from 2.05–2.10 Å. In the sixth Rh+3.38+ site, Rh+3.38+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–60°. There are a spread of Rh–O bond distances ranging from 2.05–2.12 Å. In the seventh Rh+3.38+ site, Rh+3.38+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–59°. There are a spread of Rh–O bond distances ranging from 2.03–2.07 Å. In the eighth Rh+3.38+ site, Rh+3.38+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–59°. There are a spread of Rh–O bond distances ranging from 2.03–2.07 Å. Cd2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Cd–O bond distances ranging from 2.42–2.50 Å. There are sixteen inequivalent O2- sites. In the first O2- site, O2- is bonded to one Na1+, three Rh+3.38+, and one Cd2+ atom to form distorted ONaCdRh3 trigonal bipyramids that share corners with four ONa2Rh3 square pyramids, corners with four ONaCdRh3 trigonal bipyramids, and edges with three ONa2Rh3 square pyramids. In the second O2- site, O2- is bonded to one Na1+, three Rh+3.38+, and one Cd2+ atom to form distorted ONaCdRh3 trigonal bipyramids that share corners with four ONa2Rh3 square pyramids, corners with four ONaCdRh3 trigonal bipyramids, and edges with three ONa2Rh3 square pyramids. In the third O2- site, O2- is bonded to two Na1+ and three Rh+3.38+ atoms to form a mixture of distorted edge and corner-sharing ONa2Rh3 trigonal bipyramids. In the fourth O2- site, O2- is bonded to two Na1+ and three Rh+3.38+ atoms to form a mixture of distorted edge and corner-sharing ONa2Rh3 trigonal bipyramids. In the fifth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three Rh+3.38+ atoms. In the sixth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three Rh+3.38+ atoms. In the seventh O2- site, O2- is bonded in a 5-coordinate geometry to three Rh+3.38+ and two equivalent Cd2+ atoms. In the eighth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three Rh+3.38+ atoms. In the ninth O2- site, O2- is bonded to two equivalent Na1+ and three Rh+3.38+ atoms to form distorted ONa2Rh3 square pyramids that share corners with four ONaCdRh3 trigonal bipyramids, edges with four ONa2Rh3 square pyramids, and edges with three ONaCdRh3 trigonal bipyramids. In the tenth O2- site, O2- is bonded to two equivalent Na1+ and three Rh+3.38+ atoms to form distorted ONa2Rh3 square pyramids that share corners with four ONaCdRh3 trigonal bipyramids, edges with four ONa2Rh3 square pyramids, and edges with three ONaCdRh3 trigonal bipyramids. In the eleventh O2- site, O2- is bonded to three Rh+3.38+ and two equivalent Cd2+ atoms to form distorted OCd2Rh3 square pyramids that share corners with four ONaCdRh3 trigonal bipyramids, edges with four ONa2Rh3 square pyramids, and edges with three ONaCdRh3 trigonal bipyramids. In the twelfth O2- site, O2- is bonded to two equivalent Na1+ and three Rh+3.38+ atoms to form distorted ONa2Rh3 square pyramids that share corners with four ONaCdRh3 trigonal bipyramids, edges with four ONa2Rh3 square pyramids, and edges with three ONaCdRh3 trigonal bipyramids. In the thirteenth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three Rh+3.38+ atoms. In the fourteenth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three Rh+3.38+ atoms. In the fifteenth O2- site, O2- is bonded in a 5-coordinate geometry to three Rh+3.38+ and two equivalent Cd2+ atoms. In the sixteenth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three Rh+3.38+ atoms.
CaRh2O4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ca–O bond distances ranging from 2.39–2.63 Å. There are two inequivalent Rh3+ sites. In the first Rh3+ site, Rh3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 51–62°. There are a spread of Rh–O bond distances ranging from 2.06–2.12 Å. In the second Rh3+ site, Rh3+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 51–62°. There are a spread of Rh–O bond distances ranging from 2.07–2.11 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ca2+ and three equivalent Rh3+ atoms. In the second O2- site, O2- is bonded to two equivalent Ca2+ and three Rh3+ atoms to form a mixture of distorted edge and corner-sharing OCa2Rh3 trigonal bipyramids. In the third O2- site, O2- is bonded to two equivalent Ca2+ and three equivalent Rh3+ atoms to form a mixture of distorted edge and corner-sharing OCa2Rh3 square pyramids. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Ca2+ and three Rh3+ atoms.
MgRh2O4 is Spinel structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Mg2+ is bonded to four equivalent O2- atoms to form MgO4 tetrahedra that share corners with twelve equivalent RhO6 octahedra. The corner-sharing octahedral tilt angles are 58°. All Mg–O bond lengths are 2.03 Å. Rh3+ is bonded to six equivalent O2- atoms to form RhO6 octahedra that share corners with six equivalent MgO4 tetrahedra and edges with six equivalent RhO6 octahedra. All Rh–O bond lengths are 2.08 Å. O2- is bonded to one Mg2+ and three equivalent Rh3+ atoms to form a mixture of distorted edge and corner-sharing OMgRh3 trigonal pyramids.
CuRh2O4 is Spinel structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Rh+3.50+ is bonded to six equivalent O2- atoms to form RhO6 octahedra that share corners with six equivalent CuO4 tetrahedra and edges with six equivalent RhO6 octahedra. All Rh–O bond lengths are 2.07 Å. Cu1+ is bonded to four equivalent O2- atoms to form CuO4 tetrahedra that share corners with twelve equivalent RhO6 octahedra. The corner-sharing octahedral tilt angles are 58°. All Cu–O bond lengths are 2.03 Å. O2- is bonded to three equivalent Rh+3.50+ and one Cu1+ atom to form a mixture of distorted corner and edge-sharing OCuRh3 trigonal pyramids.
ZnRh2O4 is Spinel structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Rh3+ is bonded to six equivalent O2- atoms to form RhO6 octahedra that share corners with six equivalent ZnO4 tetrahedra and edges with six equivalent RhO6 octahedra. All Rh–O bond lengths are 2.08 Å. Zn2+ is bonded to four equivalent O2- atoms to form ZnO4 tetrahedra that share corners with twelve equivalent RhO6 octahedra. The corner-sharing octahedral tilt angles are 58°. All Zn–O bond lengths are 2.03 Å. O2- is bonded to three equivalent Rh3+ and one Zn2+ atom to form a mixture of distorted edge and corner-sharing OZnRh3 trigonal pyramids.
NaRh2O4 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.42–2.55 Å. There are two inequivalent Rh+3.50+ sites. In the first Rh+3.50+ site, Rh+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–59°. There are a spread of Rh–O bond distances ranging from 2.02–2.07 Å. In the second Rh+3.50+ site, Rh+3.50+ is bonded to six O2- atoms to form a mixture of edge and corner-sharing RhO6 octahedra. The corner-sharing octahedra tilt angles range from 50–59°. There are two shorter (2.04 Å) and four longer (2.06 Å) Rh–O bond lengths. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three Rh+3.50+ atoms. In the second O2- site, O2- is bonded to two equivalent Na1+ and three equivalent Rh+3.50+ atoms to form a mixture of distorted edge and corner-sharing ONa2Rh3 square pyramids. In the third O2- site, O2- is bonded to two equivalent Na1+ and three Rh+3.50+ atoms to form a mixture of distorted edge and corner-sharing ONa2Rh3 trigonal bipyramids. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to two equivalent Na1+ and three equivalent Rh+3.50+ atoms.
CuRh2O4 is Spinel structured and crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Rh+3.50+ is bonded to six equivalent O2- atoms to form RhO6 octahedra that share corners with six equivalent CuO4 tetrahedra and edges with six equivalent RhO6 octahedra. All Rh–O bond lengths are 2.07 Å. Cu1+ is bonded to four equivalent O2- atoms to form CuO4 tetrahedra that share corners with twelve equivalent RhO6 octahedra. The corner-sharing octahedra tilt angles range from 56–63°. All Cu–O bond lengths are 2.03 Å. O2- is bonded in a rectangular see-saw-like geometry to three equivalent Rh+3.50+ and one Cu1+ atom.