K11Cd2Sb5 crystallizes in the triclinic P-1 space group. There are eleven inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one Cd(2), one Sb(2), one Sb(4), and two equivalent Sb(5) atoms. In the second K site, K(2) is bonded in a 4-coordinate geometry to one Cd(1), one Cd(2), one Sb(1), one Sb(3), one Sb(4), and one Sb(5) atom. In the third K site, K(3) is bonded in a 4-coordinate geometry to one Sb(1), one Sb(2), and two equivalent Sb(3) atoms. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one Cd(1), one Cd(2), one Sb(1), one Sb(3), and two equivalent Sb(2) atoms. In the fifth K site, K(5) is bonded in a 6-coordinate geometry to two equivalent Cd(2), one Sb(2), one Sb(5), and two equivalent Sb(1) atoms. In the sixth K site, K(6) is bonded in a 1-coordinate geometry to one Cd(1), one Cd(2), one Sb(1), one Sb(2), one Sb(3), one Sb(4), and one Sb(5) atom. In the seventh K site, K(7) is bonded in a 6-coordinate geometry to two equivalent Cd(1), one Sb(3), one Sb(4), and two equivalent Sb(1) atoms. In the eighth K site, K(8) is bonded in a 5-coordinate geometry to one Cd(1), one Sb(3), one Sb(5), and two equivalent Sb(4) atoms. In the ninth K site, K(9) is bonded in a distorted tetrahedral geometry to one Sb(2), one Sb(3), one Sb(4), and one Sb(5) atom. In the tenth K site, K(10) is bonded in a 4-coordinate geometry to one Sb(2), one Sb(3), one Sb(4), and one Sb(5) atom. In the eleventh K site, K(11) is bonded in a distorted trigonal planar geometry to one Sb(2), one Sb(4), and one Sb(5) atom. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 9-coordinate geometry to one K(2), one K(4), one K(6), one K(8), two equivalent K(7), one Sb(1), one Sb(3), and one Sb(4) atom. In the second Cd site, Cd(2) is bonded in a 9-coordinate geometry to one K(1), one K(2), one K(4), one K(6), two equivalent K(5), one Sb(1), one Sb(2), and one Sb(5) atom. There are five inequivalent Sb sites. In the first Sb site, Sb(4) is bonded in a 10-coordinate geometry to one K(1), one K(10), one K(11), one K(2), one K(6), one K(7), one K(9), two equivalent K(8), and one Cd(1) atom. In the second Sb site, Sb(5) is bonded in a 10-coordinate geometry to one K(10), one K(11), one K(2), one K(5), one K(6), one K(8), one K(9), two equivalent K(1), and one Cd(2) atom. In the third Sb site, Sb(1) is bonded in a 10-coordinate geometry to one K(2), one K(3), one K(4), one K(6), two equivalent K(5), two equivalent K(7), one Cd(1), and one Cd(2) atom. In the fourth Sb site, Sb(2) is bonded in a 10-coordinate geometry to one K(1), one K(10), one K(11), one K(3), one K(5), one K(6), one K(9), two equivalent K(4), and one Cd(2) atom. In the fifth Sb site, Sb(3) is bonded in a 10-coordinate geometry to one K(10), one K(2), one K(4), one K(6), one K(7), one K(8), one K(9), two equivalent K(3), and one Cd(1) atom.
K11Cd2Sb5 crystallizes in the triclinic P-1 space group. There are eleven inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one Cd(2), one Sb(2), one Sb(4), and two equivalent Sb(5) atoms. The K(1)-Cd(2) bond length is 3.55 Å. The K(1)-Sb(2) bond length is 3.51 Å. The K(1)-Sb(4) bond length is 3.77 Å. There is one shorter (3.62 Å) and one longer (3.66 Å) K(1)-Sb(5) bond length. In the second K site, K(2) is bonded in a 4-coordinate geometry to one Cd(1), one Cd(2), one Sb(1), one Sb(3), one Sb(4), and one Sb(5) atom. The K(2)-Cd(1) bond length is 3.90 Å. The K(2)-Cd(2) bond length is 3.88 Å. The K(2)-Sb(1) bond length is 3.55 Å. The K(2)-Sb(3) bond length is 3.73 Å. The K(2)-Sb(4) bond length is 3.56 Å. The K(2)-Sb(5) bond length is 3.54 Å. In the third K site, K(3) is bonded in a 4-coordinate geometry to one Sb(1), one Sb(2), and two equivalent Sb(3) atoms. The K(3)-Sb(1) bond length is 3.85 Å. The K(3)-Sb(2) bond length is 3.53 Å. Both K(3)-Sb(3) bond lengths are 3.59 Å. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one Cd(1), one Cd(2), one Sb(1), one Sb(3), and two equivalent Sb(2) atoms. The K(4)-Cd(1) bond length is 3.78 Å. The K(4)-Cd(2) bond length is 3.75 Å. The K(4)-Sb(1) bond length is 3.50 Å. The K(4)-Sb(3) bond length is 3.54 Å. There is one shorter (3.50 Å) and one longer (3.76 Å) K(4)-Sb(2) bond length. In the fifth K site, K(5) is bonded in a 6-coordinate geometry to two equivalent Cd(2), one Sb(2), one Sb(5), and two equivalent Sb(1) atoms. There is one shorter (3.52 Å) and one longer (3.67 Å) K(5)-Cd(2) bond length. The K(5)-Sb(2) bond length is 3.79 Å. The K(5)-Sb(5) bond length is 3.71 Å. There is one shorter (3.66 Å) and one longer (3.68 Å) K(5)-Sb(1) bond length. In the sixth K site, K(6) is bonded in a 1-coordinate geometry to one Cd(1), one Cd(2), one Sb(1), one Sb(2), one Sb(3), one Sb(4), and one Sb(5) atom. The K(6)-Cd(1) bond length is 4.00 Å. The K(6)-Cd(2) bond length is 4.05 Å. The K(6)-Sb(1) bond length is 3.71 Å. The K(6)-Sb(2) bond length is 3.98 Å. The K(6)-Sb(3) bond length is 3.95 Å. The K(6)-Sb(4) bond length is 3.86 Å. The K(6)-Sb(5) bond length is 3.88 Å. In the seventh K site, K(7) is bonded in a 6-coordinate geometry to two equivalent Cd(1), one Sb(3), one Sb(4), and two equivalent Sb(1) atoms. There is one shorter (3.54 Å) and one longer (3.70 Å) K(7)-Cd(1) bond length. The K(7)-Sb(3) bond length is 3.87 Å. The K(7)-Sb(4) bond length is 3.72 Å. There is one shorter (3.63 Å) and one longer (3.65 Å) K(7)-Sb(1) bond length. In the eighth K site, K(8) is bonded in a 5-coordinate geometry to one Cd(1), one Sb(3), one Sb(5), and two equivalent Sb(4) atoms. The K(8)-Cd(1) bond length is 3.67 Å. The K(8)-Sb(3) bond length is 3.70 Å. The K(8)-Sb(5) bond length is 3.71 Å. There is one shorter (3.61 Å) and one longer (3.83 Å) K(8)-Sb(4) bond length. In the ninth K site, K(9) is bonded in a distorted tetrahedral geometry to one Sb(2), one Sb(3), one Sb(4), and one Sb(5) atom. The K(9)-Sb(2) bond length is 3.89 Å. The K(9)-Sb(3) bond length is 3.64 Å. The K(9)-Sb(4) bond length is 3.76 Å. The K(9)-Sb(5) bond length is 3.61 Å. In the tenth K site, K(10) is bonded in a 4-coordinate geometry to one Sb(2), one Sb(3), one Sb(4), and one Sb(5) atom. The K(10)-Sb(2) bond length is 3.94 Å. The K(10)-Sb(3) bond length is 3.69 Å. The K(10)-Sb(4) bond length is 3.58 Å. The K(10)-Sb(5) bond length is 3.99 Å. In the eleventh K site, K(11) is bonded in a distorted trigonal planar geometry to one Sb(2), one Sb(4), and one Sb(5) atom. The K(11)-Sb(2) bond length is 3.44 Å. The K(11)-Sb(4) bond length is 3.52 Å. The K(11)-Sb(5) bond length is 3.49 Å. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 9-coordinate geometry to one K(2), one K(4), one K(6), one K(8), two equivalent K(7), one Sb(1), one Sb(3), and one Sb(4) atom. The Cd(1)-Sb(1) bond length is 2.99 Å. The Cd(1)-Sb(3) bond length is 2.87 Å. The Cd(1)-Sb(4) bond length is 2.87 Å. In the second Cd site, Cd(2) is bonded in a 9-coordinate geometry to one K(1), one K(2), one K(4), one K(6), two equivalent K(5), one Sb(1), one Sb(2), and one Sb(5) atom. The Cd(2)-Sb(1) bond length is 2.97 Å. The Cd(2)-Sb(2) bond length is 2.88 Å. The Cd(2)-Sb(5) bond length is 2.88 Å. There are five inequivalent Sb sites. In the first Sb site, Sb(4) is bonded in a 10-coordinate geometry to one K(1), one K(10), one K(11), one K(2), one K(6), one K(7), one K(9), two equivalent K(8), and one Cd(1) atom. In the second Sb site, Sb(5) is bonded in a 10-coordinate geometry to one K(10), one K(11), one K(2), one K(5), one K(6), one K(8), one K(9), two equivalent K(1), and one Cd(2) atom. In the third Sb site, Sb(1) is bonded in a 10-coordinate geometry to one K(2), one K(3), one K(4), one K(6), two equivalent K(5), two equivalent K(7), one Cd(1), and one Cd(2) atom. In the fourth Sb site, Sb(2) is bonded in a 10-coordinate geometry to one K(1), one K(10), one K(11), one K(3), one K(5), one K(6), one K(9), two equivalent K(4), and one Cd(2) atom. In the fifth Sb site, Sb(3) is bonded in a 10-coordinate geometry to one K(10), one K(2), one K(4), one K(6), one K(7), one K(8), one K(9), two equivalent K(3), and one Cd(1) atom.