Ba2YBr7 crystallizes in the monoclinic C2/c space group. Ba(1) is bonded in a 8-coordinate geometry to one Br(4), two equivalent Br(2), two equivalent Br(3), and three equivalent Br(1) atoms. Y(1) is bonded in a distorted pentagonal bipyramidal geometry to one Br(4), two equivalent Br(1), two equivalent Br(2), and two equivalent Br(3) atoms. There are four inequivalent Br sites. In the first Br site, Br(1) is bonded to three equivalent Ba(1) and one Y(1) atom to form a mixture of distorted corner and edge-sharing BrBa3Y tetrahedra. In the second Br site, Br(2) is bonded in a distorted T-shaped geometry to two equivalent Ba(1) and one Y(1) atom. In the third Br site, Br(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ba(1) and one Y(1) atom. In the fourth Br site, Br(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ba(1) and one Y(1) atom.
Ba2YBr7 crystallizes in the monoclinic C2/c space group. Ba(1) is bonded in a 8-coordinate geometry to one Br(4), two equivalent Br(2), two equivalent Br(3), and three equivalent Br(1) atoms. The Ba(1)-Br(4) bond length is 3.26 Å. There is one shorter (3.38 Å) and one longer (3.56 Å) Ba(1)-Br(2) bond length. There is one shorter (3.25 Å) and one longer (3.44 Å) Ba(1)-Br(3) bond length. There are two shorter (3.40 Å) and one longer (3.46 Å) Ba(1)-Br(1) bond length. Y(1) is bonded in a distorted pentagonal bipyramidal geometry to one Br(4), two equivalent Br(1), two equivalent Br(2), and two equivalent Br(3) atoms. The Y(1)-Br(4) bond length is 3.01 Å. Both Y(1)-Br(1) bond lengths are 2.88 Å. Both Y(1)-Br(2) bond lengths are 2.93 Å. Both Y(1)-Br(3) bond lengths are 3.00 Å. There are four inequivalent Br sites. In the first Br site, Br(1) is bonded to three equivalent Ba(1) and one Y(1) atom to form a mixture of distorted corner and edge-sharing BrBa3Y tetrahedra. In the second Br site, Br(2) is bonded in a distorted T-shaped geometry to two equivalent Ba(1) and one Y(1) atom. In the third Br site, Br(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ba(1) and one Y(1) atom. In the fourth Br site, Br(4) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ba(1) and one Y(1) atom.