NaSc(SeO3)2 crystallizes in the orthorhombic Pnma space group. Na(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms. Sc(1) is bonded in an octahedral geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(3) atoms. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(2) and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Sc(1), and one Se(2) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Sc(1) and one Se(1) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Na(1), one Sc(1), and one Se(2) atom. In the fourth O site, O(3) is bonded to two equivalent Na(1), one Sc(1), and one Se(1) atom to form a mixture of distorted edge and corner-sharing ONa2ScSe tetrahedra.
NaSc(SeO3)2 crystallizes in the orthorhombic Pnma space group. Na(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms. Both Na(1)-O(2) bond lengths are 2.94 Å. Both Na(1)-O(4) bond lengths are 2.88 Å. There are two shorter (2.57 Å) and two longer (2.66 Å) Na(1)-O(3) bond lengths. Sc(1) is bonded in an octahedral geometry to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms. The Sc(1)-O(1) bond length is 2.08 Å. The Sc(1)-O(2) bond length is 2.14 Å. Both Sc(1)-O(3) bond lengths are 2.15 Å. Both Sc(1)-O(4) bond lengths are 2.12 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(3) atoms. The Se(1)-O(1) bond length is 1.72 Å. Both Se(1)-O(3) bond lengths are 1.73 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(2) and two equivalent O(4) atoms. The Se(2)-O(2) bond length is 1.73 Å. Both Se(2)-O(4) bond lengths are 1.73 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Sc(1), and one Se(2) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Sc(1) and one Se(1) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Na(1), one Sc(1), and one Se(2) atom. In the fourth O site, O(3) is bonded to two equivalent Na(1), one Sc(1), and one Se(1) atom to form a mixture of distorted edge and corner-sharing ONa2ScSe tetrahedra.