(Hg2As)2(CdI4) crystallizes in the monoclinic P2_1 space group. There are four inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a linear geometry to one As(1) and one As(2) atom. In the second Hg site, Hg(2) is bonded in a distorted T-shaped geometry to one As(1), one As(2), and one I(3) atom. In the third Hg site, Hg(3) is bonded in a linear geometry to one As(1) and one As(2) atom. In the fourth Hg site, Hg(4) is bonded in a distorted T-shaped geometry to one As(1) and one As(2) atom. Cd(1) is bonded in a tetrahedral geometry to one I(1), one I(2), one I(3), and one I(4) atom. There are two inequivalent As sites. In the first As site, As(1) is bonded to one Hg(1), one Hg(2), one Hg(3), and one Hg(4) atom to form corner-sharing AsHg4 tetrahedra. In the second As site, As(2) is bonded to one Hg(1), one Hg(2), one Hg(3), and one Hg(4) atom to form corner-sharing AsHg4 tetrahedra. There are four inequivalent I sites. In the first I site, I(1) is bonded in a single-bond geometry to one Cd(1) atom. In the second I site, I(2) is bonded in a single-bond geometry to one Cd(1) atom. In the third I site, I(3) is bonded in a distorted single-bond geometry to one Hg(2) and one Cd(1) atom. In the fourth I site, I(4) is bonded in a single-bond geometry to one Cd(1) atom.
(Hg2As)2(CdI4) crystallizes in the monoclinic P2_1 space group. There are four inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a linear geometry to one As(1) and one As(2) atom. The Hg(1)-As(1) bond length is 2.57 Å. The Hg(1)-As(2) bond length is 2.57 Å. In the second Hg site, Hg(2) is bonded in a distorted T-shaped geometry to one As(1), one As(2), and one I(3) atom. The Hg(2)-As(1) bond length is 2.58 Å. The Hg(2)-As(2) bond length is 2.57 Å. The Hg(2)-I(3) bond length is 3.39 Å. In the third Hg site, Hg(3) is bonded in a linear geometry to one As(1) and one As(2) atom. The Hg(3)-As(1) bond length is 2.58 Å. The Hg(3)-As(2) bond length is 2.57 Å. In the fourth Hg site, Hg(4) is bonded in a distorted T-shaped geometry to one As(1) and one As(2) atom. The Hg(4)-As(1) bond length is 2.57 Å. The Hg(4)-As(2) bond length is 2.57 Å. Cd(1) is bonded in a tetrahedral geometry to one I(1), one I(2), one I(3), and one I(4) atom. The Cd(1)-I(1) bond length is 2.83 Å. The Cd(1)-I(2) bond length is 2.81 Å. The Cd(1)-I(3) bond length is 2.87 Å. The Cd(1)-I(4) bond length is 2.81 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to one Hg(1), one Hg(2), one Hg(3), and one Hg(4) atom to form corner-sharing AsHg4 tetrahedra. In the second As site, As(2) is bonded to one Hg(1), one Hg(2), one Hg(3), and one Hg(4) atom to form corner-sharing AsHg4 tetrahedra. There are four inequivalent I sites. In the first I site, I(1) is bonded in a single-bond geometry to one Cd(1) atom. In the second I site, I(2) is bonded in a single-bond geometry to one Cd(1) atom. In the third I site, I(3) is bonded in a distorted single-bond geometry to one Hg(2) and one Cd(1) atom. In the fourth I site, I(4) is bonded in a single-bond geometry to one Cd(1) atom.