K2HgBr2(NO6)2 crystallizes in the orthorhombic Pnnm space group. K(1) is bonded in a 10-coordinate geometry to one O(2), two equivalent O(1), three equivalent O(4), and four equivalent O(3) atoms. Hg(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. N(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(1) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one Hg(1), and one N(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one K(1) and one N(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1), one Hg(1), and one Br(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to three equivalent K(1) and one Br(1) atom. Br(1) is bonded in a trigonal non-coplanar geometry to one O(4) and two equivalent O(3) atoms.
K2HgBr2(NO6)2 crystallizes in the orthorhombic Pnnm space group. K(1) is bonded in a 10-coordinate geometry to one O(2), two equivalent O(1), three equivalent O(4), and four equivalent O(3) atoms. The K(1)-O(2) bond length is 2.83 Å. Both K(1)-O(1) bond lengths are 2.85 Å. There is one shorter (3.00 Å) and two longer (3.10 Å) K(1)-O(4) bond lengths. There are two shorter (2.97 Å) and two longer (3.19 Å) K(1)-O(3) bond lengths. Hg(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(3) atoms. All Hg(1)-O(1) bond lengths are 2.62 Å. All Hg(1)-O(3) bond lengths are 2.47 Å. N(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(1) atoms. The N(1)-O(2) bond length is 1.25 Å. Both N(1)-O(1) bond lengths are 1.28 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one Hg(1), and one N(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one K(1) and one N(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1), one Hg(1), and one Br(1) atom. The O(3)-Br(1) bond length is 1.71 Å. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to three equivalent K(1) and one Br(1) atom. The O(4)-Br(1) bond length is 1.67 Å. Br(1) is bonded in a trigonal non-coplanar geometry to one O(4) and two equivalent O(3) atoms.