KAl2Br7 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 9-coordinate geometry to one Br(4), one Br(5), one Br(7), two equivalent Br(2), two equivalent Br(3), and two equivalent Br(6) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one Br(1), one Br(5), one Br(6), and one Br(7) atom to form corner-sharing AlBr4 tetrahedra. In the second Al site, Al(2) is bonded to one Br(1), one Br(2), one Br(3), and one Br(4) atom to form corner-sharing AlBr4 tetrahedra. There are seven inequivalent Br sites. In the first Br site, Br(6) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Al(1) atom. In the second Br site, Br(7) is bonded in a distorted L-shaped geometry to one K(1) and one Al(1) atom. In the third Br site, Br(1) is bonded in a water-like geometry to one Al(1) and one Al(2) atom. In the fourth Br site, Br(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Al(2) atom. In the fifth Br site, Br(3) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Al(2) atom. In the sixth Br site, Br(4) is bonded in a distorted L-shaped geometry to one K(1) and one Al(2) atom. In the seventh Br site, Br(5) is bonded in a distorted bent 120 degrees geometry to one K(1) and one Al(1) atom.
KAl2Br7 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 9-coordinate geometry to one Br(4), one Br(5), one Br(7), two equivalent Br(2), two equivalent Br(3), and two equivalent Br(6) atoms. The K(1)-Br(4) bond length is 3.36 Å. The K(1)-Br(5) bond length is 3.39 Å. The K(1)-Br(7) bond length is 3.46 Å. Both K(1)-Br(2) bond lengths are 3.49 Å. There is one shorter (3.58 Å) and one longer (3.93 Å) K(1)-Br(3) bond length. There is one shorter (3.71 Å) and one longer (3.80 Å) K(1)-Br(6) bond length. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one Br(1), one Br(5), one Br(6), and one Br(7) atom to form corner-sharing AlBr4 tetrahedra. The Al(1)-Br(1) bond length is 2.45 Å. The Al(1)-Br(5) bond length is 2.28 Å. The Al(1)-Br(6) bond length is 2.29 Å. The Al(1)-Br(7) bond length is 2.28 Å. In the second Al site, Al(2) is bonded to one Br(1), one Br(2), one Br(3), and one Br(4) atom to form corner-sharing AlBr4 tetrahedra. The Al(2)-Br(1) bond length is 2.42 Å. The Al(2)-Br(2) bond length is 2.30 Å. The Al(2)-Br(3) bond length is 2.28 Å. The Al(2)-Br(4) bond length is 2.28 Å. There are seven inequivalent Br sites. In the first Br site, Br(6) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Al(1) atom. In the second Br site, Br(7) is bonded in a distorted L-shaped geometry to one K(1) and one Al(1) atom. In the third Br site, Br(1) is bonded in a water-like geometry to one Al(1) and one Al(2) atom. In the fourth Br site, Br(2) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Al(2) atom. In the fifth Br site, Br(3) is bonded in a distorted single-bond geometry to two equivalent K(1) and one Al(2) atom. In the sixth Br site, Br(4) is bonded in a distorted L-shaped geometry to one K(1) and one Al(2) atom. In the seventh Br site, Br(5) is bonded in a distorted bent 120 degrees geometry to one K(1) and one Al(1) atom.