NaScAs2O7 crystallizes in the monoclinic C2 space group. Na(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(3) atoms. Sc(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form ScO6 octahedra that share corners with six equivalent As(1)O4 tetrahedra. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) 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 24-51°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sc(1) and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Sc(1), and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Na(1), one Sc(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent As(1) atoms.
NaScAs2O7 crystallizes in the monoclinic C2 space group. Na(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(3) atoms. Both Na(1)-O(2) bond lengths are 2.34 Å. Both Na(1)-O(3) bond lengths are 2.30 Å. Sc(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form ScO6 octahedra that share corners with six equivalent As(1)O4 tetrahedra. Both Sc(1)-O(1) bond lengths are 2.09 Å. Both Sc(1)-O(2) bond lengths are 2.16 Å. Both Sc(1)-O(3) bond lengths are 2.12 Å. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) 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 24-51°. The As(1)-O(1) bond length is 1.70 Å. The As(1)-O(2) bond length is 1.70 Å. The As(1)-O(3) bond length is 1.70 Å. The As(1)-O(4) bond length is 1.80 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sc(1) and one As(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Sc(1), and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Na(1), one Sc(1), and one As(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent As(1) atoms.