RbBSe3 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 10-coordinate geometry to three equivalent Se(1), three equivalent Se(3), and four equivalent Se(2) atoms. B(1) is bonded to one Se(1), one Se(2), and two equivalent Se(3) atoms to form corner-sharing BSe4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one B(1) atom. In the second Se site, Se(2) is bonded in a distorted single-bond geometry to four equivalent Rb(1) and one B(1) atom. In the third Se site, Se(3) is bonded in a distorted water-like geometry to three equivalent Rb(1) and two equivalent B(1) atoms.
RbBSe3 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 10-coordinate geometry to three equivalent Se(1), three equivalent Se(3), and four equivalent Se(2) atoms. There are a spread of Rb(1)-Se(1) bond distances ranging from 3.72-3.88 Å. There are a spread of Rb(1)-Se(3) bond distances ranging from 3.59-3.87 Å. There are a spread of Rb(1)-Se(2) bond distances ranging from 3.68-4.01 Å. B(1) is bonded to one Se(1), one Se(2), and two equivalent Se(3) atoms to form corner-sharing BSe4 tetrahedra. The B(1)-Se(1) bond length is 2.09 Å. The B(1)-Se(2) bond length is 2.06 Å. There is one shorter (2.06 Å) and one longer (2.09 Å) B(1)-Se(3) bond length. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted single-bond geometry to three equivalent Rb(1) and one B(1) atom. In the second Se site, Se(2) is bonded in a distorted single-bond geometry to four equivalent Rb(1) and one B(1) atom. In the third Se site, Se(3) is bonded in a distorted water-like geometry to three equivalent Rb(1) and two equivalent B(1) atoms.