Na2BSnAsO7 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. Sn(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra. As(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-51°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one B(1) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to two equivalent Na(1), one B(1), and one Sn(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1), one B(1), and one Sn(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Sn(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Sn(1), and one As(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Sn(1) and one As(1) atom.
Na2BSnAsO7 crystallizes in the monoclinic P2_1/m space group. Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and one O(5) atom. The Na(1)-O(1) bond length is 2.18 Å. The Na(1)-O(2) bond length is 2.30 Å. The Na(1)-O(3) bond length is 2.30 Å. The Na(1)-O(4) bond length is 2.75 Å. The Na(1)-O(5) bond length is 2.77 Å. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The B(1)-O(1) bond length is 1.32 Å. The B(1)-O(2) bond length is 1.43 Å. The B(1)-O(3) bond length is 1.45 Å. Sn(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra. The Sn(1)-O(2) bond length is 2.07 Å. The Sn(1)-O(3) bond length is 2.06 Å. The Sn(1)-O(5) bond length is 2.13 Å. The Sn(1)-O(6) bond length is 2.08 Å. Both Sn(1)-O(4) bond lengths are 2.13 Å. As(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with four equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-51°. The As(1)-O(5) bond length is 1.73 Å. The As(1)-O(6) bond length is 1.75 Å. Both As(1)-O(4) bond lengths are 1.71 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one B(1) atom. In the second O site, O(2) is bonded in a distorted trigonal pyramidal geometry to two equivalent Na(1), one B(1), and one Sn(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Na(1), one B(1), and one Sn(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Sn(1), and one As(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Sn(1), and one As(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Sn(1) and one As(1) atom.