RbCu3S2 crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a 7-coordinate geometry to three equivalent S(1) and four equivalent S(2) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted trigonal non-coplanar geometry to one S(2) and two equivalent S(1) atoms. In the second Cu site, Cu(2) is bonded in a distorted bent 120 degrees geometry to one S(1) and one S(2) atom. In the third Cu site, Cu(3) is bonded in a trigonal planar geometry to one S(1) and two equivalent S(2) atoms. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to three equivalent Rb(1), one Cu(2), one Cu(3), and two equivalent Cu(1) atoms. In the second S site, S(2) is bonded in a 8-coordinate geometry to four equivalent Rb(1), one Cu(1), one Cu(2), and two equivalent Cu(3) atoms.
RbCu3S2 crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a 7-coordinate geometry to three equivalent S(1) and four equivalent S(2) atoms. There are two shorter (3.36 Å) and one longer (3.45 Å) Rb(1)-S(1) bond length. There are two shorter (3.33 Å) and two longer (3.39 Å) Rb(1)-S(2) bond lengths. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted trigonal non-coplanar geometry to one S(2) and two equivalent S(1) atoms. The Cu(1)-S(2) bond length is 2.27 Å. Both Cu(1)-S(1) bond lengths are 2.36 Å. In the second Cu site, Cu(2) is bonded in a distorted bent 120 degrees geometry to one S(1) and one S(2) atom. The Cu(2)-S(1) bond length is 2.22 Å. The Cu(2)-S(2) bond length is 2.31 Å. In the third Cu site, Cu(3) is bonded in a trigonal planar geometry to one S(1) and two equivalent S(2) atoms. The Cu(3)-S(1) bond length is 2.32 Å. Both Cu(3)-S(2) bond lengths are 2.33 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to three equivalent Rb(1), one Cu(2), one Cu(3), and two equivalent Cu(1) atoms. In the second S site, S(2) is bonded in a 8-coordinate geometry to four equivalent Rb(1), one Cu(1), one Cu(2), and two equivalent Cu(3) atoms.