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RhGe crystallizes in the cubic P2_13 space group. The structure is three-dimensional. Rh is bonded in a 4-coordinate geometry to seven equivalent Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.47–2.84 Å. Ge is bonded in a 7-coordinate geometry to seven equivalent Rh atoms.
RhGe is Modderite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Rh is bonded in a 6-coordinate geometry to six equivalent Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.49–2.59 Å. Ge is bonded in a 6-coordinate geometry to six equivalent Rh atoms.
Rh2Ge is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Rh sites. In the first Rh site, Rh is bonded to five equivalent Ge atoms to form a mixture of distorted edge and corner-sharing RhGe5 tetrahedra. There are a spread of Rh–Ge bond distances ranging from 2.50–3.06 Å. In the second Rh site, Rh is bonded in a 3-coordinate geometry to five equivalent Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.55–2.88 Å. Ge is bonded in a 10-coordinate geometry to ten Rh atoms.
Ge3Rh5 crystallizes in the orthorhombic Pbam space group. The structure is three-dimensional. there are three inequivalent Rh sites. In the first Rh site, Rh is bonded in a 3-coordinate geometry to five Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.43–2.83 Å. In the second Rh site, Rh is bonded in a 4-coordinate geometry to six Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.45–3.13 Å. In the third Rh site, Rh is bonded in a 6-coordinate geometry to six Ge atoms. There are four shorter (2.64 Å) and two longer (2.75 Å) Rh–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 10-coordinate geometry to ten Rh atoms. In the second Ge site, Ge is bonded in a body-centered cubic geometry to eight Rh atoms.
RhGe3 is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Rh is bonded to twelve Ge atoms to form RhGe12 cuboctahedra that share corners with four equivalent RhGe12 cuboctahedra, corners with eight equivalent GeGe8Rh4 cuboctahedra, edges with eight equivalent RhGe12 cuboctahedra, edges with sixteen equivalent GeGe8Rh4 cuboctahedra, faces with four equivalent RhGe12 cuboctahedra, and faces with fourteen GeGe8Rh4 cuboctahedra. There are eight shorter (2.83 Å) and four longer (3.00 Å) Rh–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded to four equivalent Rh and eight Ge atoms to form distorted GeGe8Rh4 cuboctahedra that share corners with twelve equivalent GeGe8Rh4 cuboctahedra, edges with eight equivalent RhGe12 cuboctahedra, edges with sixteen GeGe8Rh4 cuboctahedra, faces with four equivalent RhGe12 cuboctahedra, and faces with fourteen GeGe8Rh4 cuboctahedra. There are four shorter (2.83 Å) and four longer (3.00 Å) Ge–Ge bond lengths. In the second Ge site, Ge is bonded to four equivalent Rh and eight equivalent Ge atoms to form GeGe8Rh4 cuboctahedra that share corners with four equivalent GeGe8Rh4 cuboctahedra, corners with eight equivalent RhGe12 cuboctahedra, edges with twenty-four GeGe8Rh4 cuboctahedra, faces with six equivalent RhGe12 cuboctahedra, and faces with twelve GeGe8Rh4 cuboctahedra.
Rh3Ge is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Rh is bonded to eight equivalent Rh and four equivalent Ge atoms to form distorted RhGe4Rh8 cuboctahedra that share corners with four equivalent GeRh12 cuboctahedra, corners with fourteen equivalent RhGe4Rh8 cuboctahedra, edges with six equivalent GeRh12 cuboctahedra, edges with twelve equivalent RhGe4Rh8 cuboctahedra, faces with four equivalent GeRh12 cuboctahedra, and faces with sixteen equivalent RhGe4Rh8 cuboctahedra. There are four shorter (2.70 Å) and four longer (2.76 Å) Rh–Rh bond lengths. There are two shorter (2.70 Å) and two longer (2.76 Å) Rh–Ge bond lengths. Ge is bonded to twelve equivalent Rh atoms to form GeRh12 cuboctahedra that share corners with six equivalent GeRh12 cuboctahedra, corners with twelve equivalent RhGe4Rh8 cuboctahedra, edges with eighteen equivalent RhGe4Rh8 cuboctahedra, faces with eight equivalent GeRh12 cuboctahedra, and faces with twelve equivalent RhGe4Rh8 cuboctahedra.