MgCu3TeS3Cl crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 4-coordinate geometry to one Cu(2), one S(2), and two equivalent S(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 4-coordinate geometry to one Te(1), one S(1), one S(2), and one Cl(1) atom. In the second Cu site, Cu(2) is bonded in a 3-coordinate geometry to one Mg(1), one Te(1), two equivalent S(1), and one Cl(1) atom. Te(1) is bonded in a 7-coordinate geometry to one Cu(2), two equivalent Cu(1), one S(2), two equivalent S(1), and one Cl(1) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 3-coordinate geometry to one Mg(1), one Cu(1), one Cu(2), and one Te(1) atom. In the second S site, S(2) is bonded in a distorted tetrahedral geometry to one Mg(1), two equivalent Cu(1), and one Te(1) atom. Cl(1) is bonded in a distorted trigonal non-coplanar geometry to one Cu(2), two equivalent Cu(1), and one Te(1) atom.
MgCu3TeS3Cl crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 4-coordinate geometry to one Cu(2), one S(2), and two equivalent S(1) atoms. The Mg(1)-Cu(2) bond length is 2.82 Å. The Mg(1)-S(2) bond length is 2.68 Å. Both Mg(1)-S(1) bond lengths are 2.54 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 4-coordinate geometry to one Te(1), one S(1), one S(2), and one Cl(1) atom. The Cu(1)-Te(1) bond length is 2.61 Å. The Cu(1)-S(1) bond length is 2.21 Å. The Cu(1)-S(2) bond length is 2.27 Å. The Cu(1)-Cl(1) bond length is 2.44 Å. In the second Cu site, Cu(2) is bonded in a 3-coordinate geometry to one Mg(1), one Te(1), two equivalent S(1), and one Cl(1) atom. The Cu(2)-Te(1) bond length is 3.20 Å. Both Cu(2)-S(1) bond lengths are 2.17 Å. The Cu(2)-Cl(1) bond length is 2.41 Å. Te(1) is bonded in a 7-coordinate geometry to one Cu(2), two equivalent Cu(1), one S(2), two equivalent S(1), and one Cl(1) atom. The Te(1)-S(2) bond length is 2.48 Å. Both Te(1)-S(1) bond lengths are 3.04 Å. The Te(1)-Cl(1) bond length is 3.07 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 3-coordinate geometry to one Mg(1), one Cu(1), one Cu(2), and one Te(1) atom. In the second S site, S(2) is bonded in a distorted tetrahedral geometry to one Mg(1), two equivalent Cu(1), and one Te(1) atom. Cl(1) is bonded in a distorted trigonal non-coplanar geometry to one Cu(2), two equivalent Cu(1), and one Te(1) atom.