LaSiAs3 crystallizes in the orthorhombic Pbca space group. La(1) is bonded in a 9-coordinate geometry to one As(2), four equivalent As(1), and four equivalent As(3) atoms. Si(1) is bonded to one As(3) and three equivalent As(2) atoms to form corner-sharing SiAs4 tetrahedra. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent As(1) atoms. In the second As site, As(2) is bonded in a distorted rectangular see-saw-like geometry to one La(1) and three equivalent Si(1) atoms. In the third As site, As(3) is bonded to four equivalent La(1) and one Si(1) atom to form a mixture of distorted edge and corner-sharing AsLa4Si trigonal bipyramids.
LaSiAs3 crystallizes in the orthorhombic Pbca space group. La(1) is bonded in a 9-coordinate geometry to one As(2), four equivalent As(1), and four equivalent As(3) atoms. The La(1)-As(2) bond length is 3.21 Å. There are a spread of La(1)-As(1) bond distances ranging from 3.22-3.24 Å. There are a spread of La(1)-As(3) bond distances ranging from 3.08-3.18 Å. Si(1) is bonded to one As(3) and three equivalent As(2) atoms to form corner-sharing SiAs4 tetrahedra. The Si(1)-As(3) bond length is 2.31 Å. There is one shorter (2.34 Å) and two longer (2.36 Å) Si(1)-As(2) bond lengths. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent La(1) and four equivalent As(1) atoms. There are two shorter (2.96 Å) and two longer (3.03 Å) As(1)-As(1) bond lengths. In the second As site, As(2) is bonded in a distorted rectangular see-saw-like geometry to one La(1) and three equivalent Si(1) atoms. In the third As site, As(3) is bonded to four equivalent La(1) and one Si(1) atom to form a mixture of distorted edge and corner-sharing AsLa4Si trigonal bipyramids.