CsLa2Br7 crystallizes in the orthorhombic Pnma space group. Cs(1) is bonded in a 10-coordinate geometry to two equivalent Br(1), two equivalent Br(2), two equivalent Br(4), and four equivalent Br(3) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded to one Br(4), two equivalent Br(1), two equivalent Br(2), and two equivalent Br(3) atoms to form a mixture of distorted edge and face-sharing LaBr7 pentagonal bipyramids. In the second La site, La(2) is bonded to one Br(4), two equivalent Br(1), two equivalent Br(2), and two equivalent Br(3) atoms to form a mixture of distorted edge and face-sharing LaBr7 pentagonal bipyramids. There are four inequivalent Br sites. In the first Br site, Br(4) is bonded to two equivalent Cs(1), one La(1), and one La(2) atom to form a mixture of distorted corner and edge-sharing BrCs2La2 trigonal pyramids. In the second Br site, Br(1) is bonded in a distorted L-shaped geometry to one Cs(1), one La(1), and one La(2) atom. In the third Br site, Br(2) is bonded in a distorted trigonal non-coplanar geometry to one Cs(1), one La(1), and one La(2) atom. In the fourth Br site, Br(3) is bonded to two equivalent Cs(1), one La(1), and one La(2) atom to form a mixture of distorted corner and edge-sharing BrCs2La2 tetrahedra.
CsLa2Br7 crystallizes in the orthorhombic Pnma space group. Cs(1) is bonded in a 10-coordinate geometry to two equivalent Br(1), two equivalent Br(2), two equivalent Br(4), and four equivalent Br(3) atoms. Both Cs(1)-Br(1) bond lengths are 3.97 Å. Both Cs(1)-Br(2) bond lengths are 3.80 Å. Both Cs(1)-Br(4) bond lengths are 3.94 Å. There are two shorter (3.83 Å) and two longer (3.95 Å) Cs(1)-Br(3) bond lengths. There are two inequivalent La sites. In the first La site, La(1) is bonded to one Br(4), two equivalent Br(1), two equivalent Br(2), and two equivalent Br(3) atoms to form a mixture of distorted edge and face-sharing LaBr7 pentagonal bipyramids. The La(1)-Br(4) bond length is 3.08 Å. Both La(1)-Br(1) bond lengths are 3.00 Å. Both La(1)-Br(2) bond lengths are 3.01 Å. Both La(1)-Br(3) bond lengths are 3.00 Å. In the second La site, La(2) is bonded to one Br(4), two equivalent Br(1), two equivalent Br(2), and two equivalent Br(3) atoms to form a mixture of distorted edge and face-sharing LaBr7 pentagonal bipyramids. The La(2)-Br(4) bond length is 3.03 Å. Both La(2)-Br(1) bond lengths are 3.02 Å. Both La(2)-Br(2) bond lengths are 2.98 Å. Both La(2)-Br(3) bond lengths are 3.02 Å. There are four inequivalent Br sites. In the first Br site, Br(4) is bonded to two equivalent Cs(1), one La(1), and one La(2) atom to form a mixture of distorted corner and edge-sharing BrCs2La2 trigonal pyramids. In the second Br site, Br(1) is bonded in a distorted L-shaped geometry to one Cs(1), one La(1), and one La(2) atom. In the third Br site, Br(2) is bonded in a distorted trigonal non-coplanar geometry to one Cs(1), one La(1), and one La(2) atom. In the fourth Br site, Br(3) is bonded to two equivalent Cs(1), one La(1), and one La(2) atom to form a mixture of distorted corner and edge-sharing BrCs2La2 tetrahedra.