Cd2P3I crystallizes in the monoclinic C2/c space group. Cd(1) is bonded to one P(1), two equivalent P(2), and two equivalent I(1) atoms to form distorted CdP3I2 trigonal bipyramids that share corners with two equivalent P(1)Cd2P2 tetrahedra, corners with four equivalent P(2)Cd2P2 tetrahedra, corners with seven equivalent Cd(1)P3I2 trigonal bipyramids, and  an edgeedge with one Cd(1)P3I2 trigonal bipyramid. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent Cd(1) and two equivalent P(2) atoms to form distorted PCd2P2 tetrahedra that share corners with six equivalent P(2)Cd2P2 tetrahedra and corners with four equivalent Cd(1)P3I2 trigonal bipyramids. In the second P site, P(2) is bonded to two equivalent Cd(1), one P(1), and one P(2) atom to form distorted PCd2P2 tetrahedra that share corners with three equivalent P(1)Cd2P2 tetrahedra, corners with three equivalent P(2)Cd2P2 tetrahedra, and corners with four equivalent Cd(1)P3I2 trigonal bipyramids. I(1) is bonded in a rectangular see-saw-like geometry to four equivalent Cd(1) atoms.
Cd2P3I crystallizes in the monoclinic C2/c space group. Cd(1) is bonded to one P(1), two equivalent P(2), and two equivalent I(1) atoms to form distorted CdP3I2 trigonal bipyramids that share corners with two equivalent P(1)Cd2P2 tetrahedra, corners with four equivalent P(2)Cd2P2 tetrahedra, corners with seven equivalent Cd(1)P3I2 trigonal bipyramids, and  an edgeedge with one Cd(1)P3I2 trigonal bipyramid. The Cd(1)-P(1) bond length is 2.63 Å. There is one shorter (2.63 Å) and one longer (2.72 Å) Cd(1)-P(2) bond length. There is one shorter (3.05 Å) and one longer (3.28 Å) Cd(1)-I(1) bond length. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent Cd(1) and two equivalent P(2) atoms to form distorted PCd2P2 tetrahedra that share corners with six equivalent P(2)Cd2P2 tetrahedra and corners with four equivalent Cd(1)P3I2 trigonal bipyramids. Both P(1)-P(2) bond lengths are 2.21 Å. In the second P site, P(2) is bonded to two equivalent Cd(1), one P(1), and one P(2) atom to form distorted PCd2P2 tetrahedra that share corners with three equivalent P(1)Cd2P2 tetrahedra, corners with three equivalent P(2)Cd2P2 tetrahedra, and corners with four equivalent Cd(1)P3I2 trigonal bipyramids. The P(2)-P(2) bond length is 2.20 Å. I(1) is bonded in a rectangular see-saw-like geometry to four equivalent Cd(1) atoms.