IrC4 crystallizes in the orthorhombic Pbca space group. Ir(1) is bonded in a 6-coordinate geometry to one C(1), one C(2), two equivalent C(3), and two equivalent C(4) atoms. There are four inequivalent C sites. In the first C site, C(4) is bonded to two equivalent Ir(1), one C(1), and one C(3) atom to form CIr2C2 tetrahedra that share corners with two equivalent C(4)Ir2C2 tetrahedra, corners with two equivalent C(1)IrC3 tetrahedra, corners with four equivalent C(3)Ir2C2 tetrahedra, and corners with five equivalent C(2)IrC3 tetrahedra. In the second C site, C(1) is bonded to one Ir(1), one C(4), and two equivalent C(2) atoms to form CIrC3 tetrahedra that share  a cornercorner with one C(2)IrC3 tetrahedra, corners with two equivalent C(4)Ir2C2 tetrahedra, corners with two equivalent C(1)IrC3 tetrahedra, and corners with five equivalent C(3)Ir2C2 tetrahedra. In the third C site, C(2) is bonded to one Ir(1), one C(3), and two equivalent C(1) atoms to form CIrC3 tetrahedra that share  a cornercorner with one C(1)IrC3 tetrahedra, corners with two equivalent C(3)Ir2C2 tetrahedra, corners with two equivalent C(2)IrC3 tetrahedra, and corners with five equivalent C(4)Ir2C2 tetrahedra. In the fourth C site, C(3) is bonded to two equivalent Ir(1), one C(2), and one C(4) atom to form CIr2C2 tetrahedra that share corners with two equivalent C(2)IrC3 tetrahedra, corners with four equivalent C(4)Ir2C2 tetrahedra, corners with five equivalent C(1)IrC3 tetrahedra, and  an edgeedge with one C(3)Ir2C2 tetrahedra.
IrC4 crystallizes in the orthorhombic Pbca space group. Ir(1) is bonded in a 6-coordinate geometry to one C(1), one C(2), two equivalent C(3), and two equivalent C(4) atoms. The Ir(1)-C(1) bond length is 2.17 Å. The Ir(1)-C(2) bond length is 2.41 Å. There is one shorter (2.11 Å) and one longer (2.22 Å) Ir(1)-C(3) bond length. There is one shorter (2.09 Å) and one longer (2.20 Å) Ir(1)-C(4) bond length. There are four inequivalent C sites. In the first C site, C(4) is bonded to two equivalent Ir(1), one C(1), and one C(3) atom to form CIr2C2 tetrahedra that share corners with two equivalent C(4)Ir2C2 tetrahedra, corners with two equivalent C(1)IrC3 tetrahedra, corners with four equivalent C(3)Ir2C2 tetrahedra, and corners with five equivalent C(2)IrC3 tetrahedra. The C(4)-C(1) bond length is 1.52 Å. The C(4)-C(3) bond length is 1.47 Å. In the second C site, C(1) is bonded to one Ir(1), one C(4), and two equivalent C(2) atoms to form CIrC3 tetrahedra that share  a cornercorner with one C(2)IrC3 tetrahedra, corners with two equivalent C(4)Ir2C2 tetrahedra, corners with two equivalent C(1)IrC3 tetrahedra, and corners with five equivalent C(3)Ir2C2 tetrahedra. There is one shorter (1.48 Å) and one longer (1.49 Å) C(1)-C(2) bond length. In the third C site, C(2) is bonded to one Ir(1), one C(3), and two equivalent C(1) atoms to form CIrC3 tetrahedra that share  a cornercorner with one C(1)IrC3 tetrahedra, corners with two equivalent C(3)Ir2C2 tetrahedra, corners with two equivalent C(2)IrC3 tetrahedra, and corners with five equivalent C(4)Ir2C2 tetrahedra. The C(2)-C(3) bond length is 1.47 Å. In the fourth C site, C(3) is bonded to two equivalent Ir(1), one C(2), and one C(4) atom to form CIr2C2 tetrahedra that share corners with two equivalent C(2)IrC3 tetrahedra, corners with four equivalent C(4)Ir2C2 tetrahedra, corners with five equivalent C(1)IrC3 tetrahedra, and  an edgeedge with one C(3)Ir2C2 tetrahedra.