IrP2 crystallizes in the monoclinic P2_1/c space group. Ir(1) is bonded to three equivalent P(1) and three equivalent P(2) atoms to form distorted IrP6 octahedra that share corners with eight equivalent Ir(1)P6 octahedra, corners with three equivalent P(1)PIr3 tetrahedra, corners with three equivalent P(2)PIr3 tetrahedra, and edges with two equivalent Ir(1)P6 octahedra. The corner-sharing octahedral tilt angles range from 56-62°. There are two inequivalent P sites. In the first P site, P(1) is bonded to three equivalent Ir(1) and one P(2) atom to form PPIr3 tetrahedra that share corners with three equivalent Ir(1)P6 octahedra, corners with four equivalent P(1)PIr3 tetrahedra, corners with nine equivalent P(2)PIr3 tetrahedra, and  an edgeedge with one P(1)PIr3 tetrahedra. The corner-sharing octahedral tilt angles range from 67-71°. In the second P site, P(2) is bonded to three equivalent Ir(1) and one P(1) atom to form PPIr3 tetrahedra that share corners with three equivalent Ir(1)P6 octahedra, corners with four equivalent P(2)PIr3 tetrahedra, corners with nine equivalent P(1)PIr3 tetrahedra, and  an edgeedge with one P(2)PIr3 tetrahedra. The corner-sharing octahedral tilt angles range from 72-77°.
IrP2 crystallizes in the monoclinic P2_1/c space group. Ir(1) is bonded to three equivalent P(1) and three equivalent P(2) atoms to form distorted IrP6 octahedra that share corners with eight equivalent Ir(1)P6 octahedra, corners with three equivalent P(1)PIr3 tetrahedra, corners with three equivalent P(2)PIr3 tetrahedra, and edges with two equivalent Ir(1)P6 octahedra. The corner-sharing octahedral tilt angles range from 56-62°. There are two shorter (2.41 Å) and one longer (2.42 Å) Ir(1)-P(1) bond length. There are a spread of Ir(1)-P(2) bond distances ranging from 2.33-2.35 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to three equivalent Ir(1) and one P(2) atom to form PPIr3 tetrahedra that share corners with three equivalent Ir(1)P6 octahedra, corners with four equivalent P(1)PIr3 tetrahedra, corners with nine equivalent P(2)PIr3 tetrahedra, and  an edgeedge with one P(1)PIr3 tetrahedra. The corner-sharing octahedral tilt angles range from 67-71°. The P(1)-P(2) bond length is 2.22 Å. In the second P site, P(2) is bonded to three equivalent Ir(1) and one P(1) atom to form PPIr3 tetrahedra that share corners with three equivalent Ir(1)P6 octahedra, corners with four equivalent P(2)PIr3 tetrahedra, corners with nine equivalent P(1)PIr3 tetrahedra, and  an edgeedge with one P(2)PIr3 tetrahedra. The corner-sharing octahedral tilt angles range from 72-77°.