Tm(CuS)2 crystallizes in the trigonal P-3m1 space group. Tm(1) is bonded to six equivalent S(1) atoms to form distorted edge-sharing TmS6 octahedra. Cu(1) is bonded in a 4-coordinate geometry to four equivalent S(1) atoms. S(1) is bonded in a 7-coordinate geometry to three equivalent Tm(1) and four equivalent Cu(1) atoms.
Tm(CuS)2 crystallizes in the trigonal P-3m1 space group. Tm(1) is bonded to six equivalent S(1) atoms to form distorted edge-sharing TmS6 octahedra. All Tm(1)-S(1) bond lengths are 2.80 Å. Cu(1) is bonded in a 4-coordinate geometry to four equivalent S(1) atoms. There are three shorter (2.32 Å) and one longer (2.51 Å) Cu(1)-S(1) bond length. S(1) is bonded in a 7-coordinate geometry to three equivalent Tm(1) and four equivalent Cu(1) atoms.