RbAg3Se2 crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a 7-coordinate geometry to three equivalent Se(2) and four equivalent Se(1) atoms. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a distorted bent 120 degrees geometry to one Se(1) and three equivalent Se(2) atoms. In the second Ag site, Ag(2) is bonded in a distorted trigonal planar geometry to one Se(2) and two equivalent Se(1) atoms. In the third Ag site, Ag(3) is bonded in a distorted trigonal non-coplanar geometry to one Se(1) and two equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 8-coordinate geometry to four equivalent Rb(1), one Ag(1), one Ag(3), and two equivalent Ag(2) atoms. In the second Se site, Se(2) is bonded in a 9-coordinate geometry to three equivalent Rb(1), one Ag(2), two equivalent Ag(3), and three equivalent Ag(1) atoms.
RbAg3Se2 crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a 7-coordinate geometry to three equivalent Se(2) and four equivalent Se(1) atoms. There are two shorter (3.54 Å) and one longer (3.70 Å) Rb(1)-Se(2) bond length. There are two shorter (3.51 Å) and two longer (3.64 Å) Rb(1)-Se(1) bond lengths. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a distorted bent 120 degrees geometry to one Se(1) and three equivalent Se(2) atoms. The Ag(1)-Se(1) bond length is 2.71 Å. There is one shorter (2.62 Å) and two longer (3.17 Å) Ag(1)-Se(2) bond lengths. In the second Ag site, Ag(2) is bonded in a distorted trigonal planar geometry to one Se(2) and two equivalent Se(1) atoms. The Ag(2)-Se(2) bond length is 2.74 Å. Both Ag(2)-Se(1) bond lengths are 2.68 Å. In the third Ag site, Ag(3) is bonded in a distorted trigonal non-coplanar geometry to one Se(1) and two equivalent Se(2) atoms. The Ag(3)-Se(1) bond length is 2.61 Å. Both Ag(3)-Se(2) bond lengths are 2.76 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 8-coordinate geometry to four equivalent Rb(1), one Ag(1), one Ag(3), and two equivalent Ag(2) atoms. In the second Se site, Se(2) is bonded in a 9-coordinate geometry to three equivalent Rb(1), one Ag(2), two equivalent Ag(3), and three equivalent Ag(1) atoms.