Rb3LuCl6 crystallizes in the monoclinic C2/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(2), one Cl(3), two equivalent Cl(4), and two equivalent Cl(5) atoms. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one Cl(2), one Cl(3), one Cl(4), one Cl(5), two equivalent Cl(1), and two equivalent Cl(6) atoms. In the third Rb site, Rb(3) is bonded in a 8-coordinate geometry to one Cl(1), one Cl(2), one Cl(4), one Cl(5), two equivalent Cl(3), and two equivalent Cl(6) atoms. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in an octahedral geometry to two equivalent Cl(2), two equivalent Cl(4), and two equivalent Cl(5) atoms. In the second Lu site, Lu(2) is bonded in an octahedral geometry to two equivalent Cl(1), two equivalent Cl(3), and two equivalent Cl(6) atoms. There are six inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and one Lu(2) atom. In the second Cl site, Cl(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), and one Lu(1) atom. In the third Cl site, Cl(3) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and one Lu(2) atom. In the fourth Cl site, Cl(4) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(3), two equivalent Rb(1), and one Lu(1) atom. In the fifth Cl site, Cl(5) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), two equivalent Rb(1), and one Lu(1) atom. In the sixth Cl site, Cl(6) is bonded in a 5-coordinate geometry to two equivalent Rb(2), two equivalent Rb(3), and one Lu(2) atom.
Rb3LuCl6 crystallizes in the monoclinic C2/c space group. There are three inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(2), one Cl(3), two equivalent Cl(4), and two equivalent Cl(5) atoms. The Rb(1)-Cl(1) bond length is 3.54 Å. The Rb(1)-Cl(2) bond length is 3.44 Å. The Rb(1)-Cl(3) bond length is 3.67 Å. There is one shorter (3.47 Å) and one longer (3.48 Å) Rb(1)-Cl(4) bond length. There is one shorter (3.45 Å) and one longer (3.61 Å) Rb(1)-Cl(5) bond length. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one Cl(2), one Cl(3), one Cl(4), one Cl(5), two equivalent Cl(1), and two equivalent Cl(6) atoms. The Rb(2)-Cl(2) bond length is 3.21 Å. The Rb(2)-Cl(3) bond length is 3.23 Å. The Rb(2)-Cl(4) bond length is 3.45 Å. The Rb(2)-Cl(5) bond length is 3.43 Å. There is one shorter (3.47 Å) and one longer (3.62 Å) Rb(2)-Cl(1) bond length. There is one shorter (3.37 Å) and one longer (3.39 Å) Rb(2)-Cl(6) bond length. In the third Rb site, Rb(3) is bonded in a 8-coordinate geometry to one Cl(1), one Cl(2), one Cl(4), one Cl(5), two equivalent Cl(3), and two equivalent Cl(6) atoms. The Rb(3)-Cl(1) bond length is 3.26 Å. The Rb(3)-Cl(2) bond length is 3.46 Å. The Rb(3)-Cl(4) bond length is 3.24 Å. The Rb(3)-Cl(5) bond length is 3.44 Å. There is one shorter (3.38 Å) and one longer (3.69 Å) Rb(3)-Cl(3) bond length. There is one shorter (3.26 Å) and one longer (3.27 Å) Rb(3)-Cl(6) bond length. There are two inequivalent Lu sites. In the first Lu site, Lu(1) is bonded in an octahedral geometry to two equivalent Cl(2), two equivalent Cl(4), and two equivalent Cl(5) atoms. Both Lu(1)-Cl(2) bond lengths are 2.57 Å. Both Lu(1)-Cl(4) bond lengths are 2.60 Å. Both Lu(1)-Cl(5) bond lengths are 2.55 Å. In the second Lu site, Lu(2) is bonded in an octahedral geometry to two equivalent Cl(1), two equivalent Cl(3), and two equivalent Cl(6) atoms. Both Lu(2)-Cl(1) bond lengths are 2.59 Å. Both Lu(2)-Cl(3) bond lengths are 2.57 Å. Both Lu(2)-Cl(6) bond lengths are 2.59 Å. There are six inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), two equivalent Rb(2), and one Lu(2) atom. In the second Cl site, Cl(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), and one Lu(1) atom. In the third Cl site, Cl(3) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), and one Lu(2) atom. In the fourth Cl site, Cl(4) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(3), two equivalent Rb(1), and one Lu(1) atom. In the fifth Cl site, Cl(5) is bonded in a distorted single-bond geometry to one Rb(2), one Rb(3), two equivalent Rb(1), and one Lu(1) atom. In the sixth Cl site, Cl(6) is bonded in a 5-coordinate geometry to two equivalent Rb(2), two equivalent Rb(3), and one Lu(2) atom.