K5SnAs3 is alpha Pu-derived structured and 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 As(1), one As(3), and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing KAs4 tetrahedra. In the second K site, K(2) is bonded to one As(1), one As(2), and two equivalent As(3) atoms to form a mixture of distorted corner and edge-sharing KAs4 tetrahedra. In the third K site, K(3) is bonded in a 3-coordinate geometry to one As(1), two equivalent As(2), and two equivalent As(3) atoms. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one As(2), one As(3), and two equivalent As(1) atoms. In the fifth K site, K(5) is bonded in a 4-coordinate geometry to one Sn(1), one As(2), and two equivalent As(3) atoms. Sn(1) is bonded in a 4-coordinate geometry to one K(5), one As(2), one As(3), and two equivalent As(1) atoms. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to one K(1), one K(4), two equivalent K(2), two equivalent K(3), two equivalent K(5), and one Sn(1) atom. In the second As site, As(1) is bonded in a 7-coordinate geometry to one K(1), one K(2), one K(3), two equivalent K(4), and two equivalent Sn(1) atoms. In the third As site, As(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.
K5SnAs3 is alpha Pu-derived structured and 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 As(1), one As(3), and two equivalent As(2) atoms to form a mixture of distorted corner and edge-sharing KAs4 tetrahedra. The K(1)-As(1) bond length is 3.31 Å. The K(1)-As(3) bond length is 3.36 Å. There is one shorter (3.31 Å) and one longer (3.33 Å) K(1)-As(2) bond length. In the second K site, K(2) is bonded to one As(1), one As(2), and two equivalent As(3) atoms to form a mixture of distorted corner and edge-sharing KAs4 tetrahedra. The K(2)-As(1) bond length is 3.38 Å. The K(2)-As(2) bond length is 3.34 Å. There is one shorter (3.35 Å) and one longer (3.52 Å) K(2)-As(3) bond length. In the third K site, K(3) is bonded in a 3-coordinate geometry to one As(1), two equivalent As(2), and two equivalent As(3) atoms. The K(3)-As(1) bond length is 3.49 Å. There is one shorter (3.51 Å) and one longer (3.83 Å) K(3)-As(2) bond length. There is one shorter (3.40 Å) and one longer (3.88 Å) K(3)-As(3) bond length. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one As(2), one As(3), and two equivalent As(1) atoms. The K(4)-As(2) bond length is 3.40 Å. The K(4)-As(3) bond length is 3.45 Å. There is one shorter (3.33 Å) and one longer (3.59 Å) K(4)-As(1) bond length. In the fifth K site, K(5) is bonded in a 4-coordinate geometry to one Sn(1), one As(2), and two equivalent As(3) atoms. The K(5)-Sn(1) bond length is 3.59 Å. The K(5)-As(2) bond length is 3.32 Å. There is one shorter (3.42 Å) and one longer (3.52 Å) K(5)-As(3) bond length. Sn(1) is bonded in a 4-coordinate geometry to one K(5), one As(2), one As(3), and two equivalent As(1) atoms. The Sn(1)-As(2) bond length is 2.64 Å. The Sn(1)-As(3) bond length is 2.65 Å. Both Sn(1)-As(1) bond lengths are 2.73 Å. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to one K(1), one K(4), two equivalent K(2), two equivalent K(3), two equivalent K(5), and one Sn(1) atom. In the second As site, As(1) is bonded in a 7-coordinate geometry to one K(1), one K(2), one K(3), two equivalent K(4), and two equivalent Sn(1) atoms. In the third As site, As(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.