Sr2SnS5 crystallizes in the orthorhombic P2_12_12 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one S(2), one S(4), one S(6), two equivalent S(1), two equivalent S(3), and two equivalent S(5) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one S(6), two equivalent S(1), two equivalent S(3), two equivalent S(4), and two equivalent S(5) atoms. Sn(1) is bonded to one S(2), one S(3), one S(5), and two equivalent S(4) atoms to form corner-sharing SnS5 square pyramids. There are six inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), and one S(6) atom to form distorted SSr4S trigonal bipyramids that share  a cornercorner with one S(1)Sr4S trigonal bipyramid, corners with four equivalent S(3)Sr4Sn trigonal bipyramids, corners with four equivalent S(5)Sr4Sn trigonal bipyramids, edges with two equivalent S(1)Sr4S trigonal bipyramids, edges with two equivalent S(3)Sr4Sn trigonal bipyramids, and edges with two equivalent S(5)Sr4Sn trigonal bipyramids. In the second S site, S(2) is bonded in a see-saw-like geometry to two equivalent Sr(1) and two equivalent Sn(1) atoms. In the third S site, S(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), and one Sn(1) atom to form distorted SSr4Sn trigonal bipyramids that share corners with four equivalent S(1)Sr4S trigonal bipyramids, corners with five equivalent S(5)Sr4Sn trigonal bipyramids, edges with two equivalent S(1)Sr4S trigonal bipyramids, edges with two equivalent S(3)Sr4Sn trigonal bipyramids, and edges with two equivalent S(5)Sr4Sn trigonal bipyramids. In the fourth S site, S(4) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), and two equivalent Sn(1) atoms. In the fifth S site, S(5) is bonded to two equivalent Sr(1), two equivalent Sr(2), and one Sn(1) atom to form distorted SSr4Sn trigonal bipyramids that share corners with four equivalent S(1)Sr4S trigonal bipyramids, corners with five equivalent S(3)Sr4Sn trigonal bipyramids, edges with two equivalent S(1)Sr4S trigonal bipyramids, edges with two equivalent S(3)Sr4Sn trigonal bipyramids, and edges with two equivalent S(5)Sr4Sn trigonal bipyramids. In the sixth S site, S(6) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent S(1) atoms.
Sr2SnS5 crystallizes in the orthorhombic P2_12_12 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one S(2), one S(4), one S(6), two equivalent S(1), two equivalent S(3), and two equivalent S(5) atoms. The Sr(1)-S(2) bond length is 3.19 Å. The Sr(1)-S(4) bond length is 3.56 Å. The Sr(1)-S(6) bond length is 3.25 Å. There is one shorter (3.11 Å) and one longer (3.17 Å) Sr(1)-S(1) bond length. There is one shorter (2.98 Å) and one longer (3.02 Å) Sr(1)-S(3) bond length. There is one shorter (3.00 Å) and one longer (3.04 Å) Sr(1)-S(5) bond length. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one S(6), two equivalent S(1), two equivalent S(3), two equivalent S(4), and two equivalent S(5) atoms. The Sr(2)-S(6) bond length is 3.30 Å. There is one shorter (3.12 Å) and one longer (3.14 Å) Sr(2)-S(1) bond length. There is one shorter (2.99 Å) and one longer (3.14 Å) Sr(2)-S(3) bond length. There is one shorter (3.16 Å) and one longer (3.20 Å) Sr(2)-S(4) bond length. There is one shorter (3.02 Å) and one longer (3.13 Å) Sr(2)-S(5) bond length. Sn(1) is bonded to one S(2), one S(3), one S(5), and two equivalent S(4) atoms to form corner-sharing SnS5 square pyramids. The Sn(1)-S(2) bond length is 2.61 Å. The Sn(1)-S(3) bond length is 2.46 Å. The Sn(1)-S(5) bond length is 2.43 Å. There is one shorter (2.47 Å) and one longer (2.77 Å) Sn(1)-S(4) bond length. There are six inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), and one S(6) atom to form distorted SSr4S trigonal bipyramids that share  a cornercorner with one S(1)Sr4S trigonal bipyramid, corners with four equivalent S(3)Sr4Sn trigonal bipyramids, corners with four equivalent S(5)Sr4Sn trigonal bipyramids, edges with two equivalent S(1)Sr4S trigonal bipyramids, edges with two equivalent S(3)Sr4Sn trigonal bipyramids, and edges with two equivalent S(5)Sr4Sn trigonal bipyramids. The S(1)-S(6) bond length is 2.07 Å. In the second S site, S(2) is bonded in a see-saw-like geometry to two equivalent Sr(1) and two equivalent Sn(1) atoms. In the third S site, S(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), and one Sn(1) atom to form distorted SSr4Sn trigonal bipyramids that share corners with four equivalent S(1)Sr4S trigonal bipyramids, corners with five equivalent S(5)Sr4Sn trigonal bipyramids, edges with two equivalent S(1)Sr4S trigonal bipyramids, edges with two equivalent S(3)Sr4Sn trigonal bipyramids, and edges with two equivalent S(5)Sr4Sn trigonal bipyramids. In the fourth S site, S(4) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), and two equivalent Sn(1) atoms. In the fifth S site, S(5) is bonded to two equivalent Sr(1), two equivalent Sr(2), and one Sn(1) atom to form distorted SSr4Sn trigonal bipyramids that share corners with four equivalent S(1)Sr4S trigonal bipyramids, corners with five equivalent S(3)Sr4Sn trigonal bipyramids, edges with two equivalent S(1)Sr4S trigonal bipyramids, edges with two equivalent S(3)Sr4Sn trigonal bipyramids, and edges with two equivalent S(5)Sr4Sn trigonal bipyramids. In the sixth S site, S(6) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent S(1) atoms.