CdCl2 is trigonal omega-like structured and crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of one CdCl2 sheet oriented in the (0, 0, 1) direction. Cd2+ is bonded to six equivalent Cl1- atoms to form edge-sharing CdCl6 octahedra. There are two shorter (2.67 Å) and four longer (2.69 Å) Cd–Cl bond lengths. Cl1- is bonded in a distorted T-shaped geometry to three equivalent Cd2+ atoms.