K2Pd3Se4 crystallizes in the triclinic P1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 14-coordinate geometry to two equivalent Pd(1), two equivalent Pd(5), two equivalent Pd(6), one Se(1), one Se(2), three equivalent Se(5), and three equivalent Se(8) atoms. In the second K site, K(2) is bonded in a 14-coordinate geometry to two equivalent Pd(1), two equivalent Pd(5), two equivalent Pd(6), one Se(3), one Se(6), three equivalent Se(4), and three equivalent Se(7) atoms. In the third K site, K(3) is bonded in a 14-coordinate geometry to two equivalent Pd(2), two equivalent Pd(3), two equivalent Pd(4), one Se(5), one Se(8), three equivalent Se(1), and three equivalent Se(2) atoms. In the fourth K site, K(4) is bonded in a 14-coordinate geometry to two equivalent Pd(2), two equivalent Pd(3), two equivalent Pd(4), one Se(4), one Se(7), three equivalent Se(3), and three equivalent Se(6) atoms. There are six inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a distorted square co-planar geometry to two equivalent K(1), two equivalent K(2), one Se(4), one Se(5), one Se(7), and one Se(8) atom. In the second Pd site, Pd(2) is bonded in a distorted square co-planar geometry to two equivalent K(3), two equivalent K(4), one Se(1), one Se(2), one Se(3), and one Se(6) atom. In the third Pd site, Pd(3) is bonded in a distorted square co-planar geometry to two equivalent K(3), two equivalent K(4), one Se(1), one Se(2), one Se(3), and one Se(6) atom. In the fourth Pd site, Pd(4) is bonded in a distorted square co-planar geometry to two equivalent K(3), two equivalent K(4), one Se(1), one Se(2), one Se(3), and one Se(6) atom. In the fifth Pd site, Pd(5) is bonded in a distorted square co-planar geometry to two equivalent K(1), two equivalent K(2), one Se(4), one Se(5), one Se(7), and one Se(8) atom. In the sixth Pd site, Pd(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), two equivalent K(2), one Se(4), one Se(5), one Se(7), and one Se(8) atom. There are eight inequivalent Se sites. In the first Se site, Se(1) is bonded in a 7-coordinate geometry to one K(1), three equivalent K(3), one Pd(2), one Pd(3), and one Pd(4) atom. In the second Se site, Se(2) is bonded in a 7-coordinate geometry to one K(1), three equivalent K(3), one Pd(2), one Pd(3), and one Pd(4) atom. In the third Se site, Se(3) is bonded in a 7-coordinate geometry to one K(2), three equivalent K(4), one Pd(2), one Pd(3), and one Pd(4) atom. In the fourth Se site, Se(4) is bonded in a 7-coordinate geometry to one K(4), three equivalent K(2), one Pd(1), one Pd(5), and one Pd(6) atom. In the fifth Se site, Se(5) is bonded in a 7-coordinate geometry to one K(3), three equivalent K(1), one Pd(1), one Pd(5), and one Pd(6) atom. In the sixth Se site, Se(6) is bonded in a 7-coordinate geometry to one K(2), three equivalent K(4), one Pd(2), one Pd(3), and one Pd(4) atom. In the seventh Se site, Se(7) is bonded in a 7-coordinate geometry to one K(4), three equivalent K(2), one Pd(1), one Pd(5), and one Pd(6) atom. In the eighth Se site, Se(8) is bonded in a 7-coordinate geometry to one K(3), three equivalent K(1), one Pd(1), one Pd(5), and one Pd(6) atom.
K2Pd3Se4 crystallizes in the triclinic P1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 14-coordinate geometry to two equivalent Pd(1), two equivalent Pd(5), two equivalent Pd(6), one Se(1), one Se(2), three equivalent Se(5), and three equivalent Se(8) atoms. There is one shorter (3.74 Å) and one longer (3.81 Å) K(1)-Pd(1) bond length. There is one shorter (3.78 Å) and one longer (3.80 Å) K(1)-Pd(5) bond length. There is one shorter (3.82 Å) and one longer (3.83 Å) K(1)-Pd(6) bond length. The K(1)-Se(1) bond length is 3.65 Å. The K(1)-Se(2) bond length is 3.57 Å. There are a spread of K(1)-Se(5) bond distances ranging from 3.66-3.83 Å. There are a spread of K(1)-Se(8) bond distances ranging from 3.69-3.77 Å. In the second K site, K(2) is bonded in a 14-coordinate geometry to two equivalent Pd(1), two equivalent Pd(5), two equivalent Pd(6), one Se(3), one Se(6), three equivalent Se(4), and three equivalent Se(7) atoms. There is one shorter (3.79 Å) and one longer (3.87 Å) K(2)-Pd(1) bond length. There is one shorter (3.75 Å) and one longer (3.82 Å) K(2)-Pd(5) bond length. There is one shorter (3.75 Å) and one longer (3.82 Å) K(2)-Pd(6) bond length. The K(2)-Se(3) bond length is 3.61 Å. The K(2)-Se(6) bond length is 3.54 Å. There are two shorter (3.74 Å) and one longer (3.76 Å) K(2)-Se(4) bond length. There are a spread of K(2)-Se(7) bond distances ranging from 3.71-3.79 Å. In the third K site, K(3) is bonded in a 14-coordinate geometry to two equivalent Pd(2), two equivalent Pd(3), two equivalent Pd(4), one Se(5), one Se(8), three equivalent Se(1), and three equivalent Se(2) atoms. There is one shorter (3.82 Å) and one longer (3.85 Å) K(3)-Pd(2) bond length. There is one shorter (3.75 Å) and one longer (3.86 Å) K(3)-Pd(3) bond length. There is one shorter (3.76 Å) and one longer (3.85 Å) K(3)-Pd(4) bond length. The K(3)-Se(5) bond length is 3.55 Å. The K(3)-Se(8) bond length is 3.54 Å. There are two shorter (3.73 Å) and one longer (3.79 Å) K(3)-Se(1) bond length. There are a spread of K(3)-Se(2) bond distances ranging from 3.68-3.82 Å. In the fourth K site, K(4) is bonded in a 14-coordinate geometry to two equivalent Pd(2), two equivalent Pd(3), two equivalent Pd(4), one Se(4), one Se(7), three equivalent Se(3), and three equivalent Se(6) atoms. There is one shorter (3.77 Å) and one longer (3.79 Å) K(4)-Pd(2) bond length. There is one shorter (3.78 Å) and one longer (3.84 Å) K(4)-Pd(3) bond length. There is one shorter (3.71 Å) and one longer (3.86 Å) K(4)-Pd(4) bond length. The K(4)-Se(4) bond length is 3.57 Å. The K(4)-Se(7) bond length is 3.57 Å. There are a spread of K(4)-Se(3) bond distances ranging from 3.69-3.78 Å. There are a spread of K(4)-Se(6) bond distances ranging from 3.72-3.77 Å. There are six inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a distorted square co-planar geometry to two equivalent K(1), two equivalent K(2), one Se(4), one Se(5), one Se(7), and one Se(8) atom. The Pd(1)-Se(4) bond length is 2.48 Å. The Pd(1)-Se(5) bond length is 2.51 Å. The Pd(1)-Se(7) bond length is 2.50 Å. The Pd(1)-Se(8) bond length is 2.48 Å. In the second Pd site, Pd(2) is bonded in a distorted square co-planar geometry to two equivalent K(3), two equivalent K(4), one Se(1), one Se(2), one Se(3), and one Se(6) atom. The Pd(2)-Se(1) bond length is 2.47 Å. The Pd(2)-Se(2) bond length is 2.52 Å. The Pd(2)-Se(3) bond length is 2.48 Å. The Pd(2)-Se(6) bond length is 2.45 Å. In the third Pd site, Pd(3) is bonded in a distorted square co-planar geometry to two equivalent K(3), two equivalent K(4), one Se(1), one Se(2), one Se(3), and one Se(6) atom. The Pd(3)-Se(1) bond length is 2.46 Å. The Pd(3)-Se(2) bond length is 2.54 Å. The Pd(3)-Se(3) bond length is 2.48 Å. The Pd(3)-Se(6) bond length is 2.50 Å. In the fourth Pd site, Pd(4) is bonded in a distorted square co-planar geometry to two equivalent K(3), two equivalent K(4), one Se(1), one Se(2), one Se(3), and one Se(6) atom. The Pd(4)-Se(1) bond length is 2.50 Å. The Pd(4)-Se(2) bond length is 2.49 Å. The Pd(4)-Se(3) bond length is 2.46 Å. The Pd(4)-Se(6) bond length is 2.51 Å. In the fifth Pd site, Pd(5) is bonded in a distorted square co-planar geometry to two equivalent K(1), two equivalent K(2), one Se(4), one Se(5), one Se(7), and one Se(8) atom. The Pd(5)-Se(4) bond length is 2.48 Å. The Pd(5)-Se(5) bond length is 2.56 Å. The Pd(5)-Se(7) bond length is 2.54 Å. The Pd(5)-Se(8) bond length is 2.54 Å. In the sixth Pd site, Pd(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), two equivalent K(2), one Se(4), one Se(5), one Se(7), and one Se(8) atom. The Pd(6)-Se(4) bond length is 2.43 Å. The Pd(6)-Se(5) bond length is 2.49 Å. The Pd(6)-Se(7) bond length is 2.48 Å. The Pd(6)-Se(8) bond length is 2.48 Å. There are eight inequivalent Se sites. In the first Se site, Se(1) is bonded in a 7-coordinate geometry to one K(1), three equivalent K(3), one Pd(2), one Pd(3), and one Pd(4) atom. In the second Se site, Se(2) is bonded in a 7-coordinate geometry to one K(1), three equivalent K(3), one Pd(2), one Pd(3), and one Pd(4) atom. In the third Se site, Se(3) is bonded in a 7-coordinate geometry to one K(2), three equivalent K(4), one Pd(2), one Pd(3), and one Pd(4) atom. In the fourth Se site, Se(4) is bonded in a 7-coordinate geometry to one K(4), three equivalent K(2), one Pd(1), one Pd(5), and one Pd(6) atom. In the fifth Se site, Se(5) is bonded in a 7-coordinate geometry to one K(3), three equivalent K(1), one Pd(1), one Pd(5), and one Pd(6) atom. In the sixth Se site, Se(6) is bonded in a 7-coordinate geometry to one K(2), three equivalent K(4), one Pd(2), one Pd(3), and one Pd(4) atom. In the seventh Se site, Se(7) is bonded in a 7-coordinate geometry to one K(4), three equivalent K(2), one Pd(1), one Pd(5), and one Pd(6) atom. In the eighth Se site, Se(8) is bonded in a 7-coordinate geometry to one K(3), three equivalent K(1), one Pd(1), one Pd(5), and one Pd(6) atom.