IrC4 is Hausmannite-like structured and crystallizes in the monoclinic P2_1/c space group. Ir(1) is bonded to two equivalent C(2) and four equivalent C(1) atoms to form distorted IrC6 octahedra that share corners with four equivalent Ir(1)C6 octahedra, corners with four equivalent C(1)Ir2C2 tetrahedra, and corners with ten equivalent C(2)IrC3 tetrahedra. The corner-sharing octahedral tilt angles are 75°. There are two inequivalent C sites. In the first C site, C(1) is bonded to two equivalent Ir(1) and two equivalent C(2) atoms to form CIr2C2 tetrahedra that share corners with two equivalent Ir(1)C6 octahedra, corners with six equivalent C(2)IrC3 tetrahedra, and corners with eight equivalent C(1)Ir2C2 tetrahedra. The corner-sharing octahedral tilt angles range from 79-83°. In the second C site, C(2) is bonded to one Ir(1), one C(2), and two equivalent C(1) atoms to form CIrC3 tetrahedra that share corners with five equivalent Ir(1)C6 octahedra, corners with three equivalent C(2)IrC3 tetrahedra, and corners with six equivalent C(1)Ir2C2 tetrahedra. The corner-sharing octahedral tilt angles range from 59-77°.
IrC4 is Hausmannite-like structured and crystallizes in the monoclinic P2_1/c space group. Ir(1) is bonded to two equivalent C(2) and four equivalent C(1) atoms to form distorted IrC6 octahedra that share corners with four equivalent Ir(1)C6 octahedra, corners with four equivalent C(1)Ir2C2 tetrahedra, and corners with ten equivalent C(2)IrC3 tetrahedra. The corner-sharing octahedral tilt angles are 75°. Both Ir(1)-C(2) bond lengths are 2.46 Å. There are two shorter (2.08 Å) and two longer (2.18 Å) Ir(1)-C(1) bond lengths. There are two inequivalent C sites. In the first C site, C(1) is bonded to two equivalent Ir(1) and two equivalent C(2) atoms to form CIr2C2 tetrahedra that share corners with two equivalent Ir(1)C6 octahedra, corners with six equivalent C(2)IrC3 tetrahedra, and corners with eight equivalent C(1)Ir2C2 tetrahedra. The corner-sharing octahedral tilt angles range from 79-83°. There is one shorter (1.47 Å) and one longer (1.48 Å) C(1)-C(2) bond length. In the second C site, C(2) is bonded to one Ir(1), one C(2), and two equivalent C(1) atoms to form CIrC3 tetrahedra that share corners with five equivalent Ir(1)C6 octahedra, corners with three equivalent C(2)IrC3 tetrahedra, and corners with six equivalent C(1)Ir2C2 tetrahedra. The corner-sharing octahedral tilt angles range from 59-77°. The C(2)-C(2) bond length is 1.46 Å.