IrAs3 is Skutterudite structured and crystallizes in the cubic Im-3 space group. Ir(1) is bonded to six equivalent As(1) atoms to form IrAs6 octahedra that share corners with six equivalent Ir(1)As6 octahedra and corners with twelve equivalent As(1)As2Ir2 tetrahedra. The corner-sharing octahedral tilt angles are 60°. As(1) is bonded to two equivalent Ir(1) and two equivalent As(1) atoms to form AsAs2Ir2 tetrahedra that share corners with four equivalent Ir(1)As6 octahedra, corners with ten equivalent As(1)As2Ir2 tetrahedra, and  an edgeedge with one As(1)As2Ir2 tetrahedra. The corner-sharing octahedral tilt angles range from 69-70°.
IrAs3 is Skutterudite structured and crystallizes in the cubic Im-3 space group. Ir(1) is bonded to six equivalent As(1) atoms to form IrAs6 octahedra that share corners with six equivalent Ir(1)As6 octahedra and corners with twelve equivalent As(1)As2Ir2 tetrahedra. The corner-sharing octahedral tilt angles are 60°. All Ir(1)-As(1) bond lengths are 2.46 Å. As(1) is bonded to two equivalent Ir(1) and two equivalent As(1) atoms to form AsAs2Ir2 tetrahedra that share corners with four equivalent Ir(1)As6 octahedra, corners with ten equivalent As(1)As2Ir2 tetrahedra, and  an edgeedge with one As(1)As2Ir2 tetrahedra. The corner-sharing octahedral tilt angles range from 69-70°. There is one shorter (2.47 Å) and one longer (2.59 Å) As(1)-As(1) bond length.