Ba2YI7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one I(1), one I(11), one I(12), one I(14), one I(2), one I(3), one I(8), and one I(9) atom. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one I(10), one I(13), one I(3), one I(4), one I(5), one I(6), one I(7), and one I(9) atom. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to one I(1), one I(10), one I(14), one I(2), one I(4), one I(6), one I(8), and one I(9) atom. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to one I(1), one I(10), one I(11), one I(12), one I(13), one I(2), one I(5), and one I(7) atom. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in an octahedral geometry to one I(11), one I(13), one I(3), one I(5), one I(6), and one I(7) atom. In the second Y site, Y(2) is bonded in an octahedral geometry to one I(1), one I(12), one I(14), one I(2), one I(4), and one I(8) atom. There are fourteen inequivalent I sites. In the first I site, I(1) is bonded in a distorted trigonal pyramidal geometry to one Ba(1), one Ba(3), one Ba(4), and one Y(2) atom. In the second I site, I(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Ba(4), and one Y(2) atom. In the third I site, I(3) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the fourth I site, I(4) is bonded in a distorted trigonal planar geometry to one Ba(2), one Ba(3), and one Y(2) atom. In the fifth I site, I(5) is bonded in a distorted trigonal non-coplanar geometry to one Ba(2), one Ba(4), and one Y(1) atom. In the sixth I site, I(6) is bonded in a 3-coordinate geometry to one Ba(2), one Ba(3), and one Y(1) atom. In the seventh I site, I(7) is bonded in a 3-coordinate geometry to one Ba(2), one Ba(4), and one Y(1) atom. In the eighth I site, I(8) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(3), and one Y(2) atom. In the ninth I site, I(9) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Ba(3) atom. In the tenth I site, I(10) is bonded in a distorted T-shaped geometry to one Ba(2), one Ba(3), and one Ba(4) atom. In the eleventh I site, I(11) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(4), and one Y(1) atom. In the twelfth I site, I(12) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(4), and one Y(2) atom. In the thirteenth I site, I(13) is bonded in a 3-coordinate geometry to one Ba(2), one Ba(4), and one Y(1) atom. In the fourteenth I site, I(14) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(3), and one Y(2) atom.
Ba2YI7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one I(1), one I(11), one I(12), one I(14), one I(2), one I(3), one I(8), and one I(9) atom. The Ba(1)-I(1) bond length is 3.68 Å. The Ba(1)-I(11) bond length is 3.61 Å. The Ba(1)-I(12) bond length is 3.75 Å. The Ba(1)-I(14) bond length is 3.95 Å. The Ba(1)-I(2) bond length is 4.14 Å. The Ba(1)-I(3) bond length is 3.82 Å. The Ba(1)-I(8) bond length is 3.60 Å. The Ba(1)-I(9) bond length is 3.52 Å. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one I(10), one I(13), one I(3), one I(4), one I(5), one I(6), one I(7), and one I(9) atom. The Ba(2)-I(10) bond length is 3.52 Å. The Ba(2)-I(13) bond length is 3.72 Å. The Ba(2)-I(3) bond length is 3.61 Å. The Ba(2)-I(4) bond length is 3.68 Å. The Ba(2)-I(5) bond length is 3.80 Å. The Ba(2)-I(6) bond length is 3.65 Å. The Ba(2)-I(7) bond length is 3.64 Å. The Ba(2)-I(9) bond length is 3.50 Å. In the third Ba site, Ba(3) is bonded in a 8-coordinate geometry to one I(1), one I(10), one I(14), one I(2), one I(4), one I(6), one I(8), and one I(9) atom. The Ba(3)-I(1) bond length is 3.91 Å. The Ba(3)-I(10) bond length is 3.49 Å. The Ba(3)-I(14) bond length is 3.56 Å. The Ba(3)-I(2) bond length is 3.69 Å. The Ba(3)-I(4) bond length is 3.59 Å. The Ba(3)-I(6) bond length is 3.63 Å. The Ba(3)-I(8) bond length is 3.64 Å. The Ba(3)-I(9) bond length is 3.56 Å. In the fourth Ba site, Ba(4) is bonded in a 8-coordinate geometry to one I(1), one I(10), one I(11), one I(12), one I(13), one I(2), one I(5), and one I(7) atom. The Ba(4)-I(1) bond length is 4.16 Å. The Ba(4)-I(10) bond length is 3.50 Å. The Ba(4)-I(11) bond length is 3.65 Å. The Ba(4)-I(12) bond length is 3.52 Å. The Ba(4)-I(13) bond length is 3.57 Å. The Ba(4)-I(2) bond length is 4.15 Å. The Ba(4)-I(5) bond length is 3.68 Å. The Ba(4)-I(7) bond length is 3.90 Å. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in an octahedral geometry to one I(11), one I(13), one I(3), one I(5), one I(6), and one I(7) atom. The Y(1)-I(11) bond length is 3.07 Å. The Y(1)-I(13) bond length is 3.05 Å. The Y(1)-I(3) bond length is 3.03 Å. The Y(1)-I(5) bond length is 3.06 Å. The Y(1)-I(6) bond length is 3.02 Å. The Y(1)-I(7) bond length is 3.04 Å. In the second Y site, Y(2) is bonded in an octahedral geometry to one I(1), one I(12), one I(14), one I(2), one I(4), and one I(8) atom. The Y(2)-I(1) bond length is 3.05 Å. The Y(2)-I(12) bond length is 3.05 Å. The Y(2)-I(14) bond length is 3.01 Å. The Y(2)-I(2) bond length is 3.04 Å. The Y(2)-I(4) bond length is 3.01 Å. The Y(2)-I(8) bond length is 3.09 Å. There are fourteen inequivalent I sites. In the first I site, I(1) is bonded in a distorted trigonal pyramidal geometry to one Ba(1), one Ba(3), one Ba(4), and one Y(2) atom. In the second I site, I(2) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Ba(4), and one Y(2) atom. In the third I site, I(3) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the fourth I site, I(4) is bonded in a distorted trigonal planar geometry to one Ba(2), one Ba(3), and one Y(2) atom. In the fifth I site, I(5) is bonded in a distorted trigonal non-coplanar geometry to one Ba(2), one Ba(4), and one Y(1) atom. In the sixth I site, I(6) is bonded in a 3-coordinate geometry to one Ba(2), one Ba(3), and one Y(1) atom. In the seventh I site, I(7) is bonded in a 3-coordinate geometry to one Ba(2), one Ba(4), and one Y(1) atom. In the eighth I site, I(8) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(3), and one Y(2) atom. In the ninth I site, I(9) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Ba(3) atom. In the tenth I site, I(10) is bonded in a distorted T-shaped geometry to one Ba(2), one Ba(3), and one Ba(4) atom. In the eleventh I site, I(11) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(4), and one Y(1) atom. In the twelfth I site, I(12) is bonded in a distorted trigonal non-coplanar geometry to one Ba(1), one Ba(4), and one Y(2) atom. In the thirteenth I site, I(13) is bonded in a 3-coordinate geometry to one Ba(2), one Ba(4), and one Y(1) atom. In the fourteenth I site, I(14) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(3), and one Y(2) atom.