K5SnBi3 crystallizes in the monoclinic P2_1/c space group. There are five inequivalent K sites. In the first K site, K(1) is bonded to one Bi(1), one Bi(3), and two equivalent Bi(2) atoms to form a mixture of distorted edge and corner-sharing KBi4 tetrahedra. In the second K site, K(2) is bonded in a distorted see-saw-like geometry to one Bi(2), one Bi(3), and two equivalent Bi(1) atoms. In the third K site, K(3) is bonded in a 4-coordinate geometry to one Sn(1), one Bi(3), and two equivalent Bi(2) atoms. In the fourth K site, K(4) is bonded to one Bi(1), one Bi(2), and two equivalent Bi(3) atoms to form a mixture of distorted edge and corner-sharing KBi4 tetrahedra. In the fifth K site, K(5) is bonded in a 6-coordinate geometry to two equivalent Sn(1), one Bi(1), one Bi(2), and two equivalent Bi(3) atoms. Sn(1) is bonded in a 7-coordinate geometry to one K(3), two equivalent K(5), one Bi(2), one Bi(3), and two equivalent Bi(1) atoms. There are three inequivalent Bi sites. In the first Bi site, Bi(3) is bonded in a 8-coordinate geometry to one K(1), one K(2), one K(3), two equivalent K(4), two equivalent K(5), and one Sn(1) atom. In the second Bi site, Bi(1) is bonded in a 7-coordinate geometry to one K(1), one K(4), one K(5), two equivalent K(2), and two equivalent Sn(1) atoms. In the third Bi site, Bi(2) is bonded in a 8-coordinate geometry to one K(2), one K(4), one K(5), two equivalent K(1), two equivalent K(3), and one Sn(1) atom.
K5SnBi3 crystallizes in the monoclinic P2_1/c space group. There are five inequivalent K sites. In the first K site, K(1) is bonded to one Bi(1), one Bi(3), and two equivalent Bi(2) atoms to form a mixture of distorted edge and corner-sharing KBi4 tetrahedra. The K(1)-Bi(1) bond length is 3.68 Å. The K(1)-Bi(3) bond length is 3.61 Å. There is one shorter (3.61 Å) and one longer (3.83 Å) K(1)-Bi(2) bond length. In the second K site, K(2) is bonded in a distorted see-saw-like geometry to one Bi(2), one Bi(3), and two equivalent Bi(1) atoms. The K(2)-Bi(2) bond length is 3.74 Å. The K(2)-Bi(3) bond length is 3.67 Å. There is one shorter (3.62 Å) and one longer (3.86 Å) K(2)-Bi(1) bond length. In the third K site, K(3) is bonded in a 4-coordinate geometry to one Sn(1), one Bi(3), and two equivalent Bi(2) atoms. The K(3)-Sn(1) bond length is 3.91 Å. The K(3)-Bi(3) bond length is 3.66 Å. There is one shorter (3.74 Å) and one longer (3.79 Å) K(3)-Bi(2) bond length. In the fourth K site, K(4) is bonded to one Bi(1), one Bi(2), and two equivalent Bi(3) atoms to form a mixture of distorted edge and corner-sharing KBi4 tetrahedra. The K(4)-Bi(1) bond length is 3.61 Å. The K(4)-Bi(2) bond length is 3.60 Å. There is one shorter (3.62 Å) and one longer (3.63 Å) K(4)-Bi(3) bond length. In the fifth K site, K(5) is bonded in a 6-coordinate geometry to two equivalent Sn(1), one Bi(1), one Bi(2), and two equivalent Bi(3) atoms. There is one shorter (3.89 Å) and one longer (3.94 Å) K(5)-Sn(1) bond length. The K(5)-Bi(1) bond length is 3.74 Å. The K(5)-Bi(2) bond length is 3.71 Å. There is one shorter (3.84 Å) and one longer (4.07 Å) K(5)-Bi(3) bond length. Sn(1) is bonded in a 7-coordinate geometry to one K(3), two equivalent K(5), one Bi(2), one Bi(3), and two equivalent Bi(1) atoms. The Sn(1)-Bi(2) bond length is 2.98 Å. The Sn(1)-Bi(3) bond length is 2.96 Å. There is one shorter (3.04 Å) and one longer (3.05 Å) Sn(1)-Bi(1) bond length. There are three inequivalent Bi sites. In the first Bi site, Bi(3) is bonded in a 8-coordinate geometry to one K(1), one K(2), one K(3), two equivalent K(4), two equivalent K(5), and one Sn(1) atom. In the second Bi site, Bi(1) is bonded in a 7-coordinate geometry to one K(1), one K(4), one K(5), two equivalent K(2), and two equivalent Sn(1) atoms. In the third Bi site, Bi(2) is bonded in a 8-coordinate geometry to one K(2), one K(4), one K(5), two equivalent K(1), two equivalent K(3), and one Sn(1) atom.