Ba2YI7 crystallizes in the monoclinic C2/c space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one I(1), one I(3), one I(4), one I(5), one I(6), one I(7), and two equivalent I(2) atoms. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one I(1), one I(3), one I(4), one I(5), one I(6), and three equivalent I(7) atoms. Y(1) is bonded in an octahedral geometry to one I(1), one I(2), one I(3), one I(4), one I(5), and one I(6) atom. There are seven inequivalent I sites. In the first I site, I(6) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the second I site, I(7) is bonded to one Ba(1) and three equivalent Ba(2) atoms to form a mixture of distorted edge and corner-sharing IBa4 tetrahedra. In the third I site, I(1) 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(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ba(1) and one Y(1) atom. In the fifth I site, I(3) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the sixth I site, I(4) is bonded in a trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the seventh I site, I(5) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), and one Y(1) atom.
Ba2YI7 crystallizes in the monoclinic C2/c space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one I(1), one I(3), one I(4), one I(5), one I(6), one I(7), and two equivalent I(2) atoms. The Ba(1)-I(1) bond length is 3.67 Å. The Ba(1)-I(3) bond length is 3.59 Å. The Ba(1)-I(4) bond length is 3.64 Å. The Ba(1)-I(5) bond length is 3.89 Å. The Ba(1)-I(6) bond length is 3.55 Å. The Ba(1)-I(7) bond length is 3.85 Å. There is one shorter (3.60 Å) and one longer (3.71 Å) Ba(1)-I(2) bond length. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one I(1), one I(3), one I(4), one I(5), one I(6), and three equivalent I(7) atoms. The Ba(2)-I(1) bond length is 4.04 Å. The Ba(2)-I(3) bond length is 3.48 Å. The Ba(2)-I(4) bond length is 3.60 Å. The Ba(2)-I(5) bond length is 4.15 Å. The Ba(2)-I(6) bond length is 3.61 Å. There are a spread of Ba(2)-I(7) bond distances ranging from 3.44-3.90 Å. Y(1) is bonded in an octahedral geometry to one I(1), one I(2), one I(3), one I(4), one I(5), and one I(6) atom. The Y(1)-I(1) bond length is 3.07 Å. The Y(1)-I(2) bond length is 3.05 Å. The Y(1)-I(3) bond length is 3.08 Å. The Y(1)-I(4) bond length is 3.07 Å. The Y(1)-I(5) bond length is 2.99 Å. The Y(1)-I(6) bond length is 3.03 Å. There are seven inequivalent I sites. In the first I site, I(6) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the second I site, I(7) is bonded to one Ba(1) and three equivalent Ba(2) atoms to form a mixture of distorted edge and corner-sharing IBa4 tetrahedra. In the third I site, I(1) 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(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ba(1) and one Y(1) atom. In the fifth I site, I(3) is bonded in a distorted T-shaped geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the sixth I site, I(4) is bonded in a trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Y(1) atom. In the seventh I site, I(5) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), and one Y(1) atom.