CeIr2Si2 crystallizes in the tetragonal P4/nmm space group. Ce(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Ir(2), four equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Si(1), and four equivalent Si(2) atoms. In the second Ir site, Ir(2) is bonded to four equivalent Ce(1) and four equivalent Si(1) atoms to form a mixture of distorted face and edge-sharing IrCe4Si4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Ir(1), and four equivalent Ir(2) atoms. In the second Si site, Si(2) is bonded in a 4-coordinate geometry to four equivalent Ce(1) and four equivalent Ir(1) atoms.
CeIr2Si2 crystallizes in the tetragonal P4/nmm space group. Ce(1) is bonded in a 16-coordinate geometry to four equivalent Ir(1), four equivalent Ir(2), four equivalent Si(1), and four equivalent Si(2) atoms. All Ce(1)-Ir(1) bond lengths are 3.16 Å. All Ce(1)-Ir(2) bond lengths are 3.27 Å. All Ce(1)-Si(1) bond lengths are 3.20 Å. All Ce(1)-Si(2) bond lengths are 3.19 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Si(1), and four equivalent Si(2) atoms. The Ir(1)-Si(1) bond length is 2.40 Å. All Ir(1)-Si(2) bond lengths are 2.43 Å. In the second Ir site, Ir(2) is bonded to four equivalent Ce(1) and four equivalent Si(1) atoms to form a mixture of distorted face and edge-sharing IrCe4Si4 tetrahedra. All Ir(2)-Si(1) bond lengths are 2.44 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), one Ir(1), and four equivalent Ir(2) atoms. In the second Si site, Si(2) is bonded in a 4-coordinate geometry to four equivalent Ce(1) and four equivalent Ir(1) atoms.