Sr2SnSe3F2 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded in a 4-coordinate geometry to one Se(2), four equivalent Se(1), and four equivalent F(1) atoms. Sn(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form corner-sharing SnSe4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to four equivalent Sr(1) and one Sn(1) atom. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to two equivalent Sr(1) and two equivalent Sn(1) atoms. F(1) is bonded to four equivalent Sr(1) atoms to form a mixture of edge and corner-sharing FSr4 tetrahedra.
Sr2SnSe3F2 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded in a 4-coordinate geometry to one Se(2), four equivalent Se(1), and four equivalent F(1) atoms. The Sr(1)-Se(2) bond length is 3.56 Å. There are a spread of Sr(1)-Se(1) bond distances ranging from 3.28-3.37 Å. There are a spread of Sr(1)-F(1) bond distances ranging from 2.57-2.60 Å. Sn(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form corner-sharing SnSe4 tetrahedra. Both Sn(1)-Se(1) bond lengths are 2.52 Å. There is one shorter (2.60 Å) and one longer (2.61 Å) Sn(1)-Se(2) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 5-coordinate geometry to four equivalent Sr(1) and one Sn(1) atom. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to two equivalent Sr(1) and two equivalent Sn(1) atoms. F(1) is bonded to four equivalent Sr(1) atoms to form a mixture of edge and corner-sharing FSr4 tetrahedra.