EuPdAuSi2 crystallizes in the tetragonal I-4m2 space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Pd(1), four equivalent Au(1), and eight equivalent Si(1) atoms. Pd(1) 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 twelve equivalent Pd(1)Eu4Si4Au4 cuboctahedra, corners with four equivalent Au(1)Eu4Si4Pd4 tetrahedra, edges with two equivalent Au(1)Eu4Si4Pd4 tetrahedra, faces with four equivalent Pd(1)Eu4Si4Au4 cuboctahedra, and faces with four equivalent Au(1)Eu4Si4Pd4 tetrahedra. Au(1) is bonded to four equivalent Eu(1), four equivalent Pd(1), and four equivalent Si(1) atoms to form distorted AuEu4Si4Pd4 tetrahedra that share corners with four equivalent Pd(1)Eu4Si4Au4 cuboctahedra, corners with twelve equivalent Au(1)Eu4Si4Pd4 tetrahedra, edges with two equivalent Pd(1)Eu4Si4Au4 cuboctahedra, faces with four equivalent Pd(1)Eu4Si4Au4 cuboctahedra, and faces with four equivalent Au(1)Eu4Si4Pd4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Pd(1), two equivalent Au(1), and one Si(1) atom.
EuPdAuSi2 crystallizes in the tetragonal I-4m2 space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Pd(1), four equivalent Au(1), and eight equivalent Si(1) atoms. All Eu(1)-Pd(1) bond lengths are 3.33 Å. All Eu(1)-Au(1) bond lengths are 3.33 Å. All Eu(1)-Si(1) bond lengths are 3.30 Å. Pd(1) 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 twelve equivalent Pd(1)Eu4Si4Au4 cuboctahedra, corners with four equivalent Au(1)Eu4Si4Pd4 tetrahedra, edges with two equivalent Au(1)Eu4Si4Pd4 tetrahedra, faces with four equivalent Pd(1)Eu4Si4Au4 cuboctahedra, and faces with four equivalent Au(1)Eu4Si4Pd4 tetrahedra. All Pd(1)-Au(1) bond lengths are 3.08 Å. All Pd(1)-Si(1) bond lengths are 2.55 Å. Au(1) is bonded to four equivalent Eu(1), four equivalent Pd(1), and four equivalent Si(1) atoms to form distorted AuEu4Si4Pd4 tetrahedra that share corners with four equivalent Pd(1)Eu4Si4Au4 cuboctahedra, corners with twelve equivalent Au(1)Eu4Si4Pd4 tetrahedra, edges with two equivalent Pd(1)Eu4Si4Au4 cuboctahedra, faces with four equivalent Pd(1)Eu4Si4Au4 cuboctahedra, and faces with four equivalent Au(1)Eu4Si4Pd4 tetrahedra. All Au(1)-Si(1) bond lengths are 2.55 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1), two equivalent Pd(1), two equivalent Au(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.38 Å.