Pd7Se4 crystallizes in the orthorhombic P2_12_12 space group. There are four inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a distorted linear geometry to one Se(1) and one Se(3) atom. In the second Pd site, Pd(2) is bonded in a distorted square co-planar geometry to two equivalent Se(2) and two equivalent Se(3) atoms. In the third Pd site, Pd(3) is bonded in a 3-coordinate geometry to one Se(1), one Se(2), and two equivalent Se(3) atoms. In the fourth Pd site, Pd(4) is bonded in a distorted T-shaped geometry to one Se(1), one Se(2), and one Se(3) atom. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 6-coordinate geometry to two equivalent Pd(1), two equivalent Pd(3), and two equivalent Pd(4) atoms. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to two equivalent Pd(2), two equivalent Pd(3), and two equivalent Pd(4) atoms. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to one Pd(1), one Pd(2), one Pd(4), and two equivalent Pd(3) atoms.
Pd7Se4 crystallizes in the orthorhombic P2_12_12 space group. There are four inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a distorted linear geometry to one Se(1) and one Se(3) atom. The Pd(1)-Se(1) bond length is 2.43 Å. The Pd(1)-Se(3) bond length is 2.41 Å. In the second Pd site, Pd(2) is bonded in a distorted square co-planar geometry to two equivalent Se(2) and two equivalent Se(3) atoms. There is one shorter (2.61 Å) and one longer (2.70 Å) Pd(2)-Se(2) bond length. Both Pd(2)-Se(3) bond lengths are 2.59 Å. In the third Pd site, Pd(3) is bonded in a 3-coordinate geometry to one Se(1), one Se(2), and two equivalent Se(3) atoms. The Pd(3)-Se(1) bond length is 2.90 Å. The Pd(3)-Se(2) bond length is 2.59 Å. There is one shorter (2.46 Å) and one longer (2.47 Å) Pd(3)-Se(3) bond length. In the fourth Pd site, Pd(4) is bonded in a distorted T-shaped geometry to one Se(1), one Se(2), and one Se(3) atom. The Pd(4)-Se(1) bond length is 2.45 Å. The Pd(4)-Se(2) bond length is 2.54 Å. The Pd(4)-Se(3) bond length is 2.46 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 6-coordinate geometry to two equivalent Pd(1), two equivalent Pd(3), and two equivalent Pd(4) atoms. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to two equivalent Pd(2), two equivalent Pd(3), and two equivalent Pd(4) atoms. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to one Pd(1), one Pd(2), one Pd(4), and two equivalent Pd(3) atoms.