Hg2As3Br crystallizes in the monoclinic C2/c space group. Hg(1) is bonded in a 5-coordinate geometry to one As(2), two equivalent As(1), and two equivalent Br(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent Hg(1), one As(1), and one As(2) atom to form distorted corner-sharing AsHg2As2 trigonal pyramids. In the second As site, As(2) is bonded to two equivalent Hg(1) and two equivalent As(1) atoms to form corner-sharing AsHg2As2 tetrahedra. Br(1) is bonded in a 4-coordinate geometry to four equivalent Hg(1) atoms.
Hg2As3Br crystallizes in the monoclinic C2/c space group. Hg(1) is bonded in a 5-coordinate geometry to one As(2), two equivalent As(1), and two equivalent Br(1) atoms. The Hg(1)-As(2) bond length is 2.59 Å. There is one shorter (2.56 Å) and one longer (3.12 Å) Hg(1)-As(1) bond length. There is one shorter (3.15 Å) and one longer (3.27 Å) Hg(1)-Br(1) bond length. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent Hg(1), one As(1), and one As(2) atom to form distorted corner-sharing AsHg2As2 trigonal pyramids. The As(1)-As(1) bond length is 2.44 Å. The As(1)-As(2) bond length is 2.45 Å. In the second As site, As(2) is bonded to two equivalent Hg(1) and two equivalent As(1) atoms to form corner-sharing AsHg2As2 tetrahedra. Br(1) is bonded in a 4-coordinate geometry to four equivalent Hg(1) atoms.