Ba2Sn2F11 crystallizes in the trigonal P3_2 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one F(10), one F(11), one F(2), one F(3), one F(5), one F(6), one F(7), one F(8), and two equivalent F(4) atoms. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one F(1), one F(10), one F(2), one F(3), one F(4), one F(5), one F(7), and one F(9) atom. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 6-coordinate geometry to one F(1), one F(2), one F(3), one F(4), one F(6), and one F(7) atom. In the second Sn site, Sn(2) is bonded in an octahedral geometry to one F(1), one F(10), one F(11), one F(6), one F(8), and one F(9) atom. There are eleven inequivalent F sites. In the first F site, F(11) is bonded in a bent 150 degrees geometry to one Ba(1) and one Sn(2) atom. In the second F site, F(1) is bonded in a 3-coordinate geometry to one Ba(2), one Sn(1), and one Sn(2) atom. In the third F site, F(2) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Sn(1) atom. In the fourth F site, F(3) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Sn(1) atom. In the fifth F site, F(4) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one Sn(1) atom. In the sixth F site, F(5) is bonded in a bent 120 degrees geometry to one Ba(1) and one Ba(2) atom. In the seventh F site, F(6) is bonded in a distorted single-bond geometry to one Ba(1), one Sn(1), and one Sn(2) atom. In the eighth F site, F(7) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), and one Sn(1) atom. In the ninth F site, F(8) is bonded in a distorted single-bond geometry to one Ba(1) and one Sn(2) atom. In the tenth F site, F(9) is bonded in a bent 120 degrees geometry to one Ba(2) and one Sn(2) atom. In the eleventh F site, F(10) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Sn(2) atom.
Ba2Sn2F11 crystallizes in the trigonal P3_2 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to one F(10), one F(11), one F(2), one F(3), one F(5), one F(6), one F(7), one F(8), and two equivalent F(4) atoms. The Ba(1)-F(10) bond length is 3.16 Å. The Ba(1)-F(11) bond length is 2.67 Å. The Ba(1)-F(2) bond length is 2.80 Å. The Ba(1)-F(3) bond length is 2.97 Å. The Ba(1)-F(5) bond length is 2.51 Å. The Ba(1)-F(6) bond length is 2.88 Å. The Ba(1)-F(7) bond length is 3.15 Å. The Ba(1)-F(8) bond length is 3.15 Å. There is one shorter (2.99 Å) and one longer (3.18 Å) Ba(1)-F(4) bond length. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one F(1), one F(10), one F(2), one F(3), one F(4), one F(5), one F(7), and one F(9) atom. The Ba(2)-F(1) bond length is 3.03 Å. The Ba(2)-F(10) bond length is 2.94 Å. The Ba(2)-F(2) bond length is 2.94 Å. The Ba(2)-F(3) bond length is 2.93 Å. The Ba(2)-F(4) bond length is 3.01 Å. The Ba(2)-F(5) bond length is 2.45 Å. The Ba(2)-F(7) bond length is 2.78 Å. The Ba(2)-F(9) bond length is 2.71 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 6-coordinate geometry to one F(1), one F(2), one F(3), one F(4), one F(6), and one F(7) atom. The Sn(1)-F(1) bond length is 2.40 Å. The Sn(1)-F(2) bond length is 2.10 Å. The Sn(1)-F(3) bond length is 2.06 Å. The Sn(1)-F(4) bond length is 2.14 Å. The Sn(1)-F(6) bond length is 2.64 Å. The Sn(1)-F(7) bond length is 2.05 Å. In the second Sn site, Sn(2) is bonded in an octahedral geometry to one F(1), one F(10), one F(11), one F(6), one F(8), and one F(9) atom. The Sn(2)-F(1) bond length is 2.04 Å. The Sn(2)-F(10) bond length is 2.00 Å. The Sn(2)-F(11) bond length is 1.99 Å. The Sn(2)-F(6) bond length is 2.02 Å. The Sn(2)-F(8) bond length is 2.02 Å. The Sn(2)-F(9) bond length is 2.01 Å. There are eleven inequivalent F sites. In the first F site, F(11) is bonded in a bent 150 degrees geometry to one Ba(1) and one Sn(2) atom. In the second F site, F(1) is bonded in a 3-coordinate geometry to one Ba(2), one Sn(1), and one Sn(2) atom. In the third F site, F(2) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Sn(1) atom. In the fourth F site, F(3) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Sn(1) atom. In the fifth F site, F(4) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Ba(1), and one Sn(1) atom. In the sixth F site, F(5) is bonded in a bent 120 degrees geometry to one Ba(1) and one Ba(2) atom. In the seventh F site, F(6) is bonded in a distorted single-bond geometry to one Ba(1), one Sn(1), and one Sn(2) atom. In the eighth F site, F(7) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), and one Sn(1) atom. In the ninth F site, F(8) is bonded in a distorted single-bond geometry to one Ba(1) and one Sn(2) atom. In the tenth F site, F(9) is bonded in a bent 120 degrees geometry to one Ba(2) and one Sn(2) atom. In the eleventh F site, F(10) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), and one Sn(2) atom.