RbTaGeS5 crystallizes in the triclinic P-1 space group. Rb(1) is bonded in a 10-coordinate geometry to one S(1), two equivalent S(2), two equivalent S(4), two equivalent S(5), and three equivalent S(3) atoms. Ta(1) is bonded to one S(3), one S(4), two equivalent S(1), and two equivalent S(2) atoms to form TaS6 octahedra that share corners with two equivalent Ge(1)S4 tetrahedra and edges with two equivalent Ta(1)S6 octahedra. Ge(1) is bonded to one S(3), one S(4), and two equivalent S(5) atoms to form GeS4 tetrahedra that share corners with two equivalent Ta(1)S6 octahedra and  an edgeedge with one Ge(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 71-75°. There are five inequivalent S sites. In the first S site, S(1) is bonded in a 3-coordinate geometry to one Rb(1) and two equivalent Ta(1) atoms. In the second S site, S(2) is bonded in a 4-coordinate geometry to two equivalent Rb(1) and two equivalent Ta(1) atoms. In the third S site, S(3) is bonded in a 2-coordinate geometry to three equivalent Rb(1), one Ta(1), and one Ge(1) atom. In the fourth S site, S(4) is bonded in a distorted water-like geometry to two equivalent Rb(1), one Ta(1), and one Ge(1) atom. In the fifth S site, S(5) is bonded in a 4-coordinate geometry to two equivalent Rb(1) and two equivalent Ge(1) atoms.
RbTaGeS5 crystallizes in the triclinic P-1 space group. Rb(1) is bonded in a 10-coordinate geometry to one S(1), two equivalent S(2), two equivalent S(4), two equivalent S(5), and three equivalent S(3) atoms. The Rb(1)-S(1) bond length is 3.53 Å. There is one shorter (3.46 Å) and one longer (3.47 Å) Rb(1)-S(2) bond length. There is one shorter (3.73 Å) and one longer (3.81 Å) Rb(1)-S(4) bond length. There is one shorter (3.52 Å) and one longer (3.59 Å) Rb(1)-S(5) bond length. There are a spread of Rb(1)-S(3) bond distances ranging from 3.47-3.89 Å. Ta(1) is bonded to one S(3), one S(4), two equivalent S(1), and two equivalent S(2) atoms to form TaS6 octahedra that share corners with two equivalent Ge(1)S4 tetrahedra and edges with two equivalent Ta(1)S6 octahedra. The Ta(1)-S(3) bond length is 2.52 Å. The Ta(1)-S(4) bond length is 2.49 Å. There is one shorter (2.31 Å) and one longer (2.58 Å) Ta(1)-S(1) bond length. There is one shorter (2.32 Å) and one longer (2.60 Å) Ta(1)-S(2) bond length. Ge(1) is bonded to one S(3), one S(4), and two equivalent S(5) atoms to form GeS4 tetrahedra that share corners with two equivalent Ta(1)S6 octahedra and  an edgeedge with one Ge(1)S4 tetrahedra. The corner-sharing octahedral tilt angles range from 71-75°. The Ge(1)-S(3) bond length is 2.19 Å. The Ge(1)-S(4) bond length is 2.19 Å. Both Ge(1)-S(5) bond lengths are 2.26 Å. There are five inequivalent S sites. In the first S site, S(1) is bonded in a 3-coordinate geometry to one Rb(1) and two equivalent Ta(1) atoms. In the second S site, S(2) is bonded in a 4-coordinate geometry to two equivalent Rb(1) and two equivalent Ta(1) atoms. In the third S site, S(3) is bonded in a 2-coordinate geometry to three equivalent Rb(1), one Ta(1), and one Ge(1) atom. In the fourth S site, S(4) is bonded in a distorted water-like geometry to two equivalent Rb(1), one Ta(1), and one Ge(1) atom. In the fifth S site, S(5) is bonded in a 4-coordinate geometry to two equivalent Rb(1) and two equivalent Ge(1) atoms.