Eu2Pd3AuSi4 crystallizes in the tetragonal P-4m2 space group. Eu(1) is bonded in a 16-coordinate geometry to two equivalent Pd(1), two equivalent Pd(2), two equivalent Pd(3), two equivalent Au(1), four equivalent Si(1), and four equivalent Si(2) atoms. There are three inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a 4-coordinate geometry to four equivalent Eu(1) and four equivalent Si(2) atoms. In the second Pd site, Pd(2) is bonded to four equivalent Eu(1), four equivalent Au(1), and four equivalent Si(1) atoms to form distorted PdEu4Si4Au4 cuboctahedra that share corners with four equivalent Pd(2)Eu4Si4Au4 cuboctahedra, faces with four equivalent Pd(2)Eu4Si4Au4 cuboctahedra, and faces with four equivalent Au(1)Eu4Si4Pd4 tetrahedra. In the third Pd site, Pd(3) is bonded in a 4-coordinate geometry to four equivalent Eu(1) and four equivalent Si(2) atoms. Au(1) is bonded to four equivalent Eu(1), four equivalent Pd(2), and four equivalent Si(1) atoms to form distorted AuEu4Si4Pd4 tetrahedra that share corners with four equivalent Au(1)Eu4Si4Pd4 tetrahedra, faces with four equivalent Pd(2)Eu4Si4Au4 cuboctahedra, and faces with four equivalent Au(1)Eu4Si4Pd4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Pd(2), two equivalent Au(1), and one Si(2) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Pd(1), two equivalent Pd(3), and one Si(1) atom.
Eu2Pd3AuSi4 crystallizes in the tetragonal P-4m2 space group. Eu(1) is bonded in a 16-coordinate geometry to two equivalent Pd(1), two equivalent Pd(2), two equivalent Pd(3), two equivalent Au(1), four equivalent Si(1), and four equivalent Si(2) atoms. Both Eu(1)-Pd(1) bond lengths are 3.27 Å. Both Eu(1)-Pd(2) bond lengths are 3.30 Å. Both Eu(1)-Pd(3) bond lengths are 3.27 Å. Both Eu(1)-Au(1) bond lengths are 3.30 Å. All Eu(1)-Si(1) bond lengths are 3.24 Å. All Eu(1)-Si(2) bond lengths are 3.26 Å. There are three inequivalent Pd sites. In the first Pd site, Pd(1) is bonded in a 4-coordinate geometry to four equivalent Eu(1) and four equivalent Si(2) atoms. All Pd(1)-Si(2) bond lengths are 2.48 Å. In the second Pd site, Pd(2) is bonded to four equivalent Eu(1), four equivalent Au(1), and four equivalent Si(1) atoms to form distorted PdEu4Si4Au4 cuboctahedra that share corners with four equivalent Pd(2)Eu4Si4Au4 cuboctahedra, faces with four equivalent Pd(2)Eu4Si4Au4 cuboctahedra, and faces with four equivalent Au(1)Eu4Si4Pd4 tetrahedra. All Pd(2)-Au(1) bond lengths are 3.03 Å. All Pd(2)-Si(1) bond lengths are 2.53 Å. In the third Pd site, Pd(3) is bonded in a 4-coordinate geometry to four equivalent Eu(1) and four equivalent Si(2) atoms. All Pd(3)-Si(2) bond lengths are 2.48 Å. Au(1) is bonded to four equivalent Eu(1), four equivalent Pd(2), and four equivalent Si(1) atoms to form distorted AuEu4Si4Pd4 tetrahedra that share corners with four equivalent Au(1)Eu4Si4Pd4 tetrahedra, faces with four equivalent Pd(2)Eu4Si4Au4 cuboctahedra, and faces with four equivalent Au(1)Eu4Si4Pd4 tetrahedra. All Au(1)-Si(1) bond lengths are 2.53 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Pd(2), two equivalent Au(1), and one Si(2) atom. The Si(1)-Si(2) bond length is 2.36 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Pd(1), two equivalent Pd(3), and one Si(1) atom.