RbFe2Se3 crystallizes in the orthorhombic Cmcm space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent Se(2) and eight equivalent Se(1) atoms. Fe(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form a mixture of distorted edge and corner-sharing FeSe4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 2-coordinate geometry to four equivalent Rb(1) and two equivalent Fe(1) atoms. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to two equivalent Rb(1) and four equivalent Fe(1) atoms.
RbFe2Se3 crystallizes in the orthorhombic Cmcm space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent Se(2) and eight equivalent Se(1) atoms. Both Rb(1)-Se(2) bond lengths are 3.69 Å. There are a spread of Rb(1)-Se(1) bond distances ranging from 3.59-4.05 Å. Fe(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form a mixture of distorted edge and corner-sharing FeSe4 tetrahedra. Both Fe(1)-Se(1) bond lengths are 2.35 Å. Both Fe(1)-Se(2) bond lengths are 2.44 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a 2-coordinate geometry to four equivalent Rb(1) and two equivalent Fe(1) atoms. In the second Se site, Se(2) is bonded in a 6-coordinate geometry to two equivalent Rb(1) and four equivalent Fe(1) atoms.