RbB3O5 crystallizes in the monoclinic C2/c space group. Rb(1) is bonded in a 7-coordinate geometry to one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(5) atom. In the third B site, B(3) is bonded to one O(2), one O(5), and two equivalent O(1) atoms to form a mixture of edge and corner-sharing BO4 tetrahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one B(1) and two equivalent B(3) atoms. In the second O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Rb(1), one B(1), and one B(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one B(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one B(1), and one B(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one B(2), and one B(3) atom.
RbB3O5 crystallizes in the monoclinic C2/c space group. Rb(1) is bonded in a 7-coordinate geometry to one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Rb(1)-O(5) bond length is 2.77 Å. There is one shorter (2.83 Å) and one longer (2.99 Å) Rb(1)-O(2) bond length. There is one shorter (2.78 Å) and one longer (3.32 Å) Rb(1)-O(3) bond length. There is one shorter (3.00 Å) and one longer (3.27 Å) Rb(1)-O(4) bond length. There are three inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing BO4 tetrahedra. The B(1)-O(1) bond length is 1.55 Å. The B(1)-O(2) bond length is 1.45 Å. The B(1)-O(3) bond length is 1.49 Å. The B(1)-O(4) bond length is 1.47 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(5) atom. The B(2)-O(3) bond length is 1.38 Å. The B(2)-O(4) bond length is 1.38 Å. The B(2)-O(5) bond length is 1.39 Å. In the third B site, B(3) is bonded to one O(2), one O(5), and two equivalent O(1) atoms to form a mixture of edge and corner-sharing BO4 tetrahedra. The B(3)-O(2) bond length is 1.43 Å. The B(3)-O(5) bond length is 1.46 Å. There is one shorter (1.53 Å) and one longer (1.56 Å) B(3)-O(1) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one B(1) and two equivalent B(3) atoms. In the second O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Rb(1), one B(1), and one B(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one B(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one B(1), and one B(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one B(2), and one B(3) atom.