Rb5Hg19 crystallizes in the tetragonal I4/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 16-coordinate geometry to eight equivalent Hg(1) and eight equivalent Hg(3) atoms. In the second Rb site, Rb(2) is bonded in a 17-coordinate geometry to one Hg(4), two equivalent Hg(2), six equivalent Hg(3), and eight equivalent Hg(1) atoms. There are four inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 10-coordinate geometry to one Rb(1), four equivalent Rb(2), one Hg(1), one Hg(2), and three equivalent Hg(3) atoms. In the second Hg site, Hg(2) is bonded in a 8-coordinate geometry to four equivalent Rb(2) and four equivalent Hg(1) atoms. In the third Hg site, Hg(3) is bonded in a 10-coordinate geometry to one Rb(1), three equivalent Rb(2), one Hg(4), two equivalent Hg(3), and three equivalent Hg(1) atoms. In the fourth Hg site, Hg(4) is bonded in a cuboctahedral geometry to four equivalent Rb(2) and eight equivalent Hg(3) atoms.
Rb5Hg19 crystallizes in the tetragonal I4/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 16-coordinate geometry to eight equivalent Hg(1) and eight equivalent Hg(3) atoms. All Rb(1)-Hg(1) bond lengths are 4.05 Å. All Rb(1)-Hg(3) bond lengths are 3.79 Å. In the second Rb site, Rb(2) is bonded in a 17-coordinate geometry to one Hg(4), two equivalent Hg(2), six equivalent Hg(3), and eight equivalent Hg(1) atoms. The Rb(2)-Hg(4) bond length is 4.06 Å. Both Rb(2)-Hg(2) bond lengths are 3.71 Å. There are a spread of Rb(2)-Hg(3) bond distances ranging from 3.78-4.12 Å. There are a spread of Rb(2)-Hg(1) bond distances ranging from 3.80-4.14 Å. There are four inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 10-coordinate geometry to one Rb(1), four equivalent Rb(2), one Hg(1), one Hg(2), and three equivalent Hg(3) atoms. The Hg(1)-Hg(1) bond length is 2.99 Å. The Hg(1)-Hg(2) bond length is 3.02 Å. There are a spread of Hg(1)-Hg(3) bond distances ranging from 3.06-3.15 Å. In the second Hg site, Hg(2) is bonded in a 8-coordinate geometry to four equivalent Rb(2) and four equivalent Hg(1) atoms. In the third Hg site, Hg(3) is bonded in a 10-coordinate geometry to one Rb(1), three equivalent Rb(2), one Hg(4), two equivalent Hg(3), and three equivalent Hg(1) atoms. The Hg(3)-Hg(4) bond length is 3.28 Å. Both Hg(3)-Hg(3) bond lengths are 3.18 Å. In the fourth Hg site, Hg(4) is bonded in a cuboctahedral geometry to four equivalent Rb(2) and eight equivalent Hg(3) atoms.