K3AuP2Se8 crystallizes in the monoclinic Cc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Au(1), one Se(1), one Se(3), one Se(4), one Se(6), one Se(7), and two equivalent Se(8) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one Se(1), one Se(2), one Se(4), one Se(7), one Se(8), and two equivalent Se(3) atoms. In the third K site, K(3) is bonded in a 10-coordinate geometry to one Au(1), one Se(1), one Se(3), one Se(7), two equivalent Se(2), two equivalent Se(4), and two equivalent Se(5) atoms. Au(1) is bonded in a 4-coordinate geometry to one K(1), one K(3), one Se(2), and one Se(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one Se(2), one Se(3), one Se(4), and one Se(5) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one Se(1), one Se(6), one Se(7), and one Se(8) atom. There are eight inequivalent Se sites. In the first Se site, Se(5) is bonded in a 1-coordinate geometry to two equivalent K(3), one P(1), and one Se(6) atom. In the second Se site, Se(6) is bonded in a 3-coordinate geometry to one K(1), one P(2), and one Se(5) atom. In the third Se site, Se(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one P(2) atom. In the fourth Se site, Se(8) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(1), one Au(1), and one P(2) atom. In the fifth Se site, Se(1) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one P(2) atom. In the sixth Se site, Se(2) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(3), one Au(1), and one P(1) atom. In the seventh Se site, Se(3) is bonded in a 5-coordinate geometry to one K(1), one K(3), two equivalent K(2), and one P(1) atom. In the eighth Se site, Se(4) is bonded in a 4-coordinate geometry to one K(1), one K(2), two equivalent K(3), and one P(1) atom.
K3AuP2Se8 crystallizes in the monoclinic Cc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Au(1), one Se(1), one Se(3), one Se(4), one Se(6), one Se(7), and two equivalent Se(8) atoms. The K(1)-Au(1) bond length is 3.83 Å. The K(1)-Se(1) bond length is 3.63 Å. The K(1)-Se(3) bond length is 3.48 Å. The K(1)-Se(4) bond length is 3.48 Å. The K(1)-Se(6) bond length is 3.48 Å. The K(1)-Se(7) bond length is 3.47 Å. There is one shorter (3.54 Å) and one longer (3.67 Å) K(1)-Se(8) bond length. In the second K site, K(2) is bonded in a 7-coordinate geometry to one Se(1), one Se(2), one Se(4), one Se(7), one Se(8), and two equivalent Se(3) atoms. The K(2)-Se(1) bond length is 3.41 Å. The K(2)-Se(2) bond length is 3.44 Å. The K(2)-Se(4) bond length is 3.52 Å. The K(2)-Se(7) bond length is 3.45 Å. The K(2)-Se(8) bond length is 3.51 Å. There is one shorter (3.55 Å) and one longer (3.79 Å) K(2)-Se(3) bond length. In the third K site, K(3) is bonded in a 10-coordinate geometry to one Au(1), one Se(1), one Se(3), one Se(7), two equivalent Se(2), two equivalent Se(4), and two equivalent Se(5) atoms. The K(3)-Au(1) bond length is 3.96 Å. The K(3)-Se(1) bond length is 3.59 Å. The K(3)-Se(3) bond length is 3.51 Å. The K(3)-Se(7) bond length is 3.51 Å. There is one shorter (3.50 Å) and one longer (3.81 Å) K(3)-Se(2) bond length. There is one shorter (3.46 Å) and one longer (3.86 Å) K(3)-Se(4) bond length. There is one shorter (3.46 Å) and one longer (3.87 Å) K(3)-Se(5) bond length. Au(1) is bonded in a 4-coordinate geometry to one K(1), one K(3), one Se(2), and one Se(8) atom. The Au(1)-Se(2) bond length is 2.42 Å. The Au(1)-Se(8) bond length is 2.42 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one Se(2), one Se(3), one Se(4), and one Se(5) atom. The P(1)-Se(2) bond length is 2.25 Å. The P(1)-Se(3) bond length is 2.16 Å. The P(1)-Se(4) bond length is 2.15 Å. The P(1)-Se(5) bond length is 2.30 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one Se(1), one Se(6), one Se(7), and one Se(8) atom. The P(2)-Se(1) bond length is 2.16 Å. The P(2)-Se(6) bond length is 2.30 Å. The P(2)-Se(7) bond length is 2.16 Å. The P(2)-Se(8) bond length is 2.25 Å. There are eight inequivalent Se sites. In the first Se site, Se(5) is bonded in a 1-coordinate geometry to two equivalent K(3), one P(1), and one Se(6) atom. The Se(5)-Se(6) bond length is 2.36 Å. In the second Se site, Se(6) is bonded in a 3-coordinate geometry to one K(1), one P(2), and one Se(5) atom. In the third Se site, Se(7) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one P(2) atom. In the fourth Se site, Se(8) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(1), one Au(1), and one P(2) atom. In the fifth Se site, Se(1) is bonded in a 4-coordinate geometry to one K(1), one K(2), one K(3), and one P(2) atom. In the sixth Se site, Se(2) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(3), one Au(1), and one P(1) atom. In the seventh Se site, Se(3) is bonded in a 5-coordinate geometry to one K(1), one K(3), two equivalent K(2), and one P(1) atom. In the eighth Se site, Se(4) is bonded in a 4-coordinate geometry to one K(1), one K(2), two equivalent K(3), and one P(1) atom.