Hg19(As5Br9)2 crystallizes in the triclinic P-1 space group. There are ten inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to two equivalent As(2), two equivalent Br(3), and two equivalent Br(4) atoms to form distorted HgAs2Br4 octahedra that share corners with two equivalent As(4)Hg3As tetrahedra. In the second Hg site, Hg(2) is bonded in a 2-coordinate geometry to one As(1) and one As(2) atom. In the third Hg site, Hg(3) is bonded in a distorted rectangular see-saw-like geometry to one As(1), one Br(2), one Br(5), and one Br(7) atom. In the fourth Hg site, Hg(4) is bonded in a 4-coordinate geometry to one As(1), one As(3), one Br(1), and one Br(2) atom. In the fifth Hg site, Hg(5) is bonded in a distorted rectangular see-saw-like geometry to one As(2), one Br(1), one Br(2), and one Br(5) atom. In the sixth Hg site, Hg(6) is bonded in a distorted T-shaped geometry to one As(3), one As(4), and one Br(2) atom. In the seventh Hg site, Hg(7) is bonded in a distorted rectangular see-saw-like geometry to one As(4), one Br(4), one Br(6), and one Br(9) atom. In the eighth Hg site, Hg(8) is bonded in a linear geometry to one As(4) and one As(5) atom. In the ninth Hg site, Hg(9) is bonded in a rectangular see-saw-like geometry to one As(3), one Br(3), one Br(4), and one Br(6) atom. In the tenth Hg site, Hg(10) is bonded in a linear geometry to one As(5) and one Br(8) atom. There are five inequivalent As sites. In the first As site, As(1) is bonded to one Hg(2), one Hg(3), one Hg(4), and one As(1) atom to form corner-sharing AsHg3As tetrahedra. In the second As site, As(2) is bonded to one Hg(1), one Hg(2), one Hg(5), and one As(4) atom to form corner-sharing AsHg3As tetrahedra. In the third As site, As(3) is bonded to one Hg(4), one Hg(6), one Hg(9), and one As(5) atom to form corner-sharing AsHg3As tetrahedra. In the fourth As site, As(4) is bonded to one Hg(6), one Hg(7), one Hg(8), and one As(2) atom to form AsHg3As tetrahedra that share  a cornercorner with one Hg(1)As2Br4 octahedra and  a cornercorner with one As(3)Hg3As tetrahedra. The corner-sharing octahedral tilt angles are 71°. In the fifth As site, As(5) is bonded in a 3-coordinate geometry to one Hg(10), one Hg(8), and one As(3) atom. There are nine inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted single-bond geometry to one Hg(4) and one Hg(5) atom. In the second Br site, Br(2) is bonded in a 4-coordinate geometry to one Hg(3), one Hg(4), one Hg(5), and one Hg(6) atom. In the third Br site, Br(3) is bonded in a distorted single-bond geometry to one Hg(1) and one Hg(9) atom. In the fourth Br site, Br(4) is bonded in a 3-coordinate geometry to one Hg(1), one Hg(7), and one Hg(9) atom. In the fifth Br site, Br(5) is bonded in a water-like geometry to one Hg(3) and one Hg(5) atom. In the sixth Br site, Br(6) is bonded in an L-shaped geometry to one Hg(7) and one Hg(9) atom. In the seventh Br site, Br(7) is bonded in a single-bond geometry to one Hg(3) atom. In the eighth Br site, Br(8) is bonded in a single-bond geometry to one Hg(10) atom. In the ninth Br site, Br(9) is bonded in a single-bond geometry to one Hg(7) atom.
Hg19(As5Br9)2 crystallizes in the triclinic P-1 space group. There are ten inequivalent Hg sites. In the first Hg site, Hg(1) is bonded to two equivalent As(2), two equivalent Br(3), and two equivalent Br(4) atoms to form distorted HgAs2Br4 octahedra that share corners with two equivalent As(4)Hg3As tetrahedra. Both Hg(1)-As(2) bond lengths are 2.63 Å. Both Hg(1)-Br(3) bond lengths are 3.23 Å. Both Hg(1)-Br(4) bond lengths are 3.18 Å. In the second Hg site, Hg(2) is bonded in a 2-coordinate geometry to one As(1) and one As(2) atom. The Hg(2)-As(1) bond length is 2.60 Å. The Hg(2)-As(2) bond length is 2.60 Å. In the third Hg site, Hg(3) is bonded in a distorted rectangular see-saw-like geometry to one As(1), one Br(2), one Br(5), and one Br(7) atom. The Hg(3)-As(1) bond length is 2.56 Å. The Hg(3)-Br(2) bond length is 3.00 Å. The Hg(3)-Br(5) bond length is 2.90 Å. The Hg(3)-Br(7) bond length is 2.60 Å. In the fourth Hg site, Hg(4) is bonded in a 4-coordinate geometry to one As(1), one As(3), one Br(1), and one Br(2) atom. The Hg(4)-As(1) bond length is 2.61 Å. The Hg(4)-As(3) bond length is 2.59 Å. The Hg(4)-Br(1) bond length is 3.24 Å. The Hg(4)-Br(2) bond length is 3.28 Å. In the fifth Hg site, Hg(5) is bonded in a distorted rectangular see-saw-like geometry to one As(2), one Br(1), one Br(2), and one Br(5) atom. The Hg(5)-As(2) bond length is 2.57 Å. The Hg(5)-Br(1) bond length is 2.63 Å. The Hg(5)-Br(2) bond length is 2.98 Å. The Hg(5)-Br(5) bond length is 2.96 Å. In the sixth Hg site, Hg(6) is bonded in a distorted T-shaped geometry to one As(3), one As(4), and one Br(2) atom. The Hg(6)-As(3) bond length is 2.60 Å. The Hg(6)-As(4) bond length is 2.60 Å. The Hg(6)-Br(2) bond length is 3.21 Å. In the seventh Hg site, Hg(7) is bonded in a distorted rectangular see-saw-like geometry to one As(4), one Br(4), one Br(6), and one Br(9) atom. The Hg(7)-As(4) bond length is 2.56 Å. The Hg(7)-Br(4) bond length is 2.97 Å. The Hg(7)-Br(6) bond length is 2.95 Å. The Hg(7)-Br(9) bond length is 2.57 Å. In the eighth Hg site, Hg(8) is bonded in a linear geometry to one As(4) and one As(5) atom. The Hg(8)-As(4) bond length is 2.61 Å. The Hg(8)-As(5) bond length is 2.57 Å. In the ninth Hg site, Hg(9) is bonded in a rectangular see-saw-like geometry to one As(3), one Br(3), one Br(4), and one Br(6) atom. The Hg(9)-As(3) bond length is 2.58 Å. The Hg(9)-Br(3) bond length is 2.69 Å. The Hg(9)-Br(4) bond length is 2.89 Å. The Hg(9)-Br(6) bond length is 2.84 Å. In the tenth Hg site, Hg(10) is bonded in a linear geometry to one As(5) and one Br(8) atom. The Hg(10)-As(5) bond length is 2.54 Å. The Hg(10)-Br(8) bond length is 2.56 Å. There are five inequivalent As sites. In the first As site, As(1) is bonded to one Hg(2), one Hg(3), one Hg(4), and one As(1) atom to form corner-sharing AsHg3As tetrahedra. The As(1)-As(1) bond length is 2.47 Å. In the second As site, As(2) is bonded to one Hg(1), one Hg(2), one Hg(5), and one As(4) atom to form corner-sharing AsHg3As tetrahedra. The As(2)-As(4) bond length is 2.46 Å. In the third As site, As(3) is bonded to one Hg(4), one Hg(6), one Hg(9), and one As(5) atom to form corner-sharing AsHg3As tetrahedra. The As(3)-As(5) bond length is 2.49 Å. In the fourth As site, As(4) is bonded to one Hg(6), one Hg(7), one Hg(8), and one As(2) atom to form AsHg3As tetrahedra that share  a cornercorner with one Hg(1)As2Br4 octahedra and  a cornercorner with one As(3)Hg3As tetrahedra. The corner-sharing octahedral tilt angles are 71°. In the fifth As site, As(5) is bonded in a 3-coordinate geometry to one Hg(10), one Hg(8), and one As(3) atom. There are nine inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted single-bond geometry to one Hg(4) and one Hg(5) atom. In the second Br site, Br(2) is bonded in a 4-coordinate geometry to one Hg(3), one Hg(4), one Hg(5), and one Hg(6) atom. In the third Br site, Br(3) is bonded in a distorted single-bond geometry to one Hg(1) and one Hg(9) atom. In the fourth Br site, Br(4) is bonded in a 3-coordinate geometry to one Hg(1), one Hg(7), and one Hg(9) atom. In the fifth Br site, Br(5) is bonded in a water-like geometry to one Hg(3) and one Hg(5) atom. In the sixth Br site, Br(6) is bonded in an L-shaped geometry to one Hg(7) and one Hg(9) atom. In the seventh Br site, Br(7) is bonded in a single-bond geometry to one Hg(3) atom. In the eighth Br site, Br(8) is bonded in a single-bond geometry to one Hg(10) atom. In the ninth Br site, Br(9) is bonded in a single-bond geometry to one Hg(7) atom.