K3Hg11 crystallizes in the orthorhombic Immm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 12-coordinate geometry to two equivalent Hg(3), two equivalent Hg(4), four equivalent Hg(2), and six equivalent Hg(1) atoms. In the second K site, K(2) is bonded to four equivalent Hg(1) and eight equivalent Hg(2) atoms to form KHg12 cuboctahedra that share edges with two equivalent Hg(4)K4Hg8 cuboctahedra and faces with two equivalent K(2)Hg12 cuboctahedra. There are four inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 10-coordinate geometry to one K(2), three equivalent K(1), one Hg(4), two equivalent Hg(3), and three equivalent Hg(2) atoms. In the second Hg site, Hg(2) is bonded in a 9-coordinate geometry to two equivalent K(1), two equivalent K(2), one Hg(2), one Hg(3), and three equivalent Hg(1) atoms. In the third Hg site, Hg(3) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent Hg(2), two equivalent Hg(4), and four equivalent Hg(1) atoms. In the fourth Hg site, Hg(4) is bonded to four equivalent K(1), four equivalent Hg(1), and four equivalent Hg(3) atoms to form distorted HgK4Hg8 cuboctahedra that share edges with two equivalent K(2)Hg12 cuboctahedra and faces with two equivalent Hg(4)K4Hg8 cuboctahedra.
K3Hg11 crystallizes in the orthorhombic Immm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 12-coordinate geometry to two equivalent Hg(3), two equivalent Hg(4), four equivalent Hg(2), and six equivalent Hg(1) atoms. Both K(1)-Hg(3) bond lengths are 3.63 Å. Both K(1)-Hg(4) bond lengths are 3.84 Å. All K(1)-Hg(2) bond lengths are 3.64 Å. There are four shorter (3.58 Å) and two longer (4.04 Å) K(1)-Hg(1) bond lengths. In the second K site, K(2) is bonded to four equivalent Hg(1) and eight equivalent Hg(2) atoms to form KHg12 cuboctahedra that share edges with two equivalent Hg(4)K4Hg8 cuboctahedra and faces with two equivalent K(2)Hg12 cuboctahedra. All K(2)-Hg(1) bond lengths are 3.75 Å. All K(2)-Hg(2) bond lengths are 3.84 Å. There are four inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a 10-coordinate geometry to one K(2), three equivalent K(1), one Hg(4), two equivalent Hg(3), and three equivalent Hg(2) atoms. The Hg(1)-Hg(4) bond length is 3.15 Å. Both Hg(1)-Hg(3) bond lengths are 3.28 Å. There are two shorter (3.06 Å) and one longer (3.08 Å) Hg(1)-Hg(2) bond length. In the second Hg site, Hg(2) is bonded in a 9-coordinate geometry to two equivalent K(1), two equivalent K(2), one Hg(2), one Hg(3), and three equivalent Hg(1) atoms. The Hg(2)-Hg(2) bond length is 2.98 Å. The Hg(2)-Hg(3) bond length is 3.07 Å. In the third Hg site, Hg(3) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent Hg(2), two equivalent Hg(4), and four equivalent Hg(1) atoms. Both Hg(3)-Hg(4) bond lengths are 3.37 Å. In the fourth Hg site, Hg(4) is bonded to four equivalent K(1), four equivalent Hg(1), and four equivalent Hg(3) atoms to form distorted HgK4Hg8 cuboctahedra that share edges with two equivalent K(2)Hg12 cuboctahedra and faces with two equivalent Hg(4)K4Hg8 cuboctahedra.