LaAu2Si2 crystallizes in the tetragonal I4/mmm space group. La(1) is bonded in a 16-coordinate geometry to eight equivalent Au(1) and eight equivalent Si(1) atoms. Au(1) is bonded to four equivalent La(1) and four equivalent Si(1) atoms to form a mixture of distorted edge, face, and corner-sharing AuLa4Si4 tetrahedra. Si(1) is bonded in a 9-coordinate geometry to four equivalent La(1), four equivalent Au(1), and one Si(1) atom.
LaAu2Si2 crystallizes in the tetragonal I4/mmm space group. La(1) is bonded in a 16-coordinate geometry to eight equivalent Au(1) and eight equivalent Si(1) atoms. All La(1)-Au(1) bond lengths are 3.36 Å. All La(1)-Si(1) bond lengths are 3.32 Å. Au(1) is bonded to four equivalent La(1) and four equivalent Si(1) atoms to form a mixture of distorted edge, face, and corner-sharing AuLa4Si4 tetrahedra. All Au(1)-Si(1) bond lengths are 2.58 Å. Si(1) is bonded in a 9-coordinate geometry to four equivalent La(1), four equivalent Au(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.36 Å.