ErCl2 is trigonal omega-like structured and crystallizes in the tetragonal P4_2/mnm space group. Er(1) is bonded to six equivalent Cl(1) atoms to form a mixture of corner and edge-sharing ErCl6 octahedra. The corner-sharing octahedral tilt angles are 39°. Cl(1) is bonded in a 3-coordinate geometry to three equivalent Er(1) atoms.
ErCl2 is trigonal omega-like structured and crystallizes in the tetragonal P4_2/mnm space group. Er(1) is bonded to six equivalent Cl(1) atoms to form a mixture of corner and edge-sharing ErCl6 octahedra. The corner-sharing octahedral tilt angles are 39°. There are two shorter (2.71 Å) and four longer (2.73 Å) Er(1)-Cl(1) bond lengths. Cl(1) is bonded in a 3-coordinate geometry to three equivalent Er(1) atoms.