RbF3 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to one F(1), one F(4), one F(5), two equivalent F(3), two equivalent F(6), and three equivalent F(2) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one F(2), one F(3), one F(6), two equivalent F(4), two equivalent F(5), and three equivalent F(1) atoms. There are six inequivalent F sites. In the first F site, F(1) is bonded in a 5-coordinate geometry to one Rb(1), three equivalent Rb(2), and one F(5) atom. In the second F site, F(2) is bonded to one Rb(2), three equivalent Rb(1), and one F(6) atom to form distorted corner-sharing FRb4F trigonal bipyramids. In the third F site, F(3) is bonded in a 4-coordinate geometry to one Rb(2), two equivalent Rb(1), and one F(6) atom. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to one Rb(1), two equivalent Rb(2), and one F(5) atom. In the fifth F site, F(5) is bonded in a 5-coordinate geometry to one Rb(1), two equivalent Rb(2), one F(1), and one F(4) atom. In the sixth F site, F(6) is bonded in a 5-coordinate geometry to one Rb(2), two equivalent Rb(1), one F(2), and one F(3) atom.
RbF3 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 10-coordinate geometry to one F(1), one F(4), one F(5), two equivalent F(3), two equivalent F(6), and three equivalent F(2) atoms. The Rb(1)-F(1) bond length is 3.17 Å. The Rb(1)-F(4) bond length is 2.87 Å. The Rb(1)-F(5) bond length is 2.85 Å. There is one shorter (2.82 Å) and one longer (2.96 Å) Rb(1)-F(3) bond length. There is one shorter (2.92 Å) and one longer (3.09 Å) Rb(1)-F(6) bond length. There are a spread of Rb(1)-F(2) bond distances ranging from 2.82-3.28 Å. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to one F(2), one F(3), one F(6), two equivalent F(4), two equivalent F(5), and three equivalent F(1) atoms. The Rb(2)-F(2) bond length is 3.10 Å. The Rb(2)-F(3) bond length is 2.84 Å. The Rb(2)-F(6) bond length is 2.88 Å. There is one shorter (2.84 Å) and one longer (2.96 Å) Rb(2)-F(4) bond length. There is one shorter (2.96 Å) and one longer (3.11 Å) Rb(2)-F(5) bond length. There are a spread of Rb(2)-F(1) bond distances ranging from 2.82-3.31 Å. There are six inequivalent F sites. In the first F site, F(1) is bonded in a 5-coordinate geometry to one Rb(1), three equivalent Rb(2), and one F(5) atom. The F(1)-F(5) bond length is 1.73 Å. In the second F site, F(2) is bonded to one Rb(2), three equivalent Rb(1), and one F(6) atom to form distorted corner-sharing FRb4F trigonal bipyramids. The F(2)-F(6) bond length is 1.73 Å. In the third F site, F(3) is bonded in a 4-coordinate geometry to one Rb(2), two equivalent Rb(1), and one F(6) atom. The F(3)-F(6) bond length is 1.74 Å. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to one Rb(1), two equivalent Rb(2), and one F(5) atom. The F(4)-F(5) bond length is 1.74 Å. In the fifth F site, F(5) is bonded in a 5-coordinate geometry to one Rb(1), two equivalent Rb(2), one F(1), and one F(4) atom. In the sixth F site, F(6) is bonded in a 5-coordinate geometry to one Rb(2), two equivalent Rb(1), one F(2), and one F(3) atom.