RbScAs2O7 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(3), one O(6), two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms. Sc(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form ScO6 octahedra that share corners with three equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form AsO4 tetrahedra that share corners with three equivalent Sc(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 17-48°. In the second As site, As(2) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form AsO4 tetrahedra that share corners with three equivalent Sc(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-54°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one Sc(1), and one As(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Rb(1), one As(1), and one As(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Sc(1), and one As(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Sc(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Sc(1), and one As(1) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Rb(1), one Sc(1), and one As(1) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Sc(1), and one As(2) atom.
RbScAs2O7 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(3), one O(6), two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms. The Rb(1)-O(1) bond length is 3.03 Å. The Rb(1)-O(2) bond length is 3.47 Å. The Rb(1)-O(3) bond length is 3.36 Å. The Rb(1)-O(6) bond length is 3.51 Å. There is one shorter (2.97 Å) and one longer (3.19 Å) Rb(1)-O(4) bond length. There is one shorter (2.95 Å) and one longer (3.20 Å) Rb(1)-O(5) bond length. There is one shorter (3.33 Å) and one longer (3.35 Å) Rb(1)-O(7) bond length. Sc(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form ScO6 octahedra that share corners with three equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. The Sc(1)-O(1) bond length is 2.14 Å. The Sc(1)-O(3) bond length is 2.10 Å. The Sc(1)-O(4) bond length is 2.13 Å. The Sc(1)-O(5) bond length is 2.13 Å. The Sc(1)-O(6) bond length is 2.06 Å. The Sc(1)-O(7) bond length is 2.15 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form AsO4 tetrahedra that share corners with three equivalent Sc(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 17-48°. The As(1)-O(2) bond length is 1.80 Å. The As(1)-O(4) bond length is 1.70 Å. The As(1)-O(5) bond length is 1.70 Å. The As(1)-O(6) bond length is 1.68 Å. In the second As site, As(2) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form AsO4 tetrahedra that share corners with three equivalent Sc(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-54°. The As(2)-O(1) bond length is 1.71 Å. The As(2)-O(2) bond length is 1.81 Å. The As(2)-O(3) bond length is 1.69 Å. The As(2)-O(7) bond length is 1.70 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one Sc(1), and one As(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Rb(1), one As(1), and one As(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Rb(1), one Sc(1), and one As(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Sc(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Sc(1), and one As(1) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Rb(1), one Sc(1), and one As(1) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Sc(1), and one As(2) atom.