Y2Hg2O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the second Y site, Y(2) is bonded to one O(2), two equivalent O(5), and three equivalent O(3) atoms to form distorted edge-sharing YO6 octahedra. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted T-shaped geometry to one O(1), one O(4), and one O(5) atom. In the second Hg site, Hg(2) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Y(1) and one Hg(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Y(2), two equivalent Y(1), and one Hg(2) atom. In the third O site, O(3) is bonded to three equivalent Y(2) and one Hg(2) atom to form a mixture of corner and edge-sharing OY3Hg trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Y(1), one Hg(1), and one Hg(2) atom. In the fifth O site, O(5) is bonded to one Y(1), two equivalent Y(2), and one Hg(1) atom to form a mixture of corner and edge-sharing OY3Hg trigonal pyramids.
Y2Hg2O5 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. The Y(1)-O(4) bond length is 2.22 Å. The Y(1)-O(5) bond length is 2.56 Å. There is one shorter (2.27 Å) and one longer (2.28 Å) Y(1)-O(1) bond length. There is one shorter (2.31 Å) and one longer (2.35 Å) Y(1)-O(2) bond length. In the second Y site, Y(2) is bonded to one O(2), two equivalent O(5), and three equivalent O(3) atoms to form distorted edge-sharing YO6 octahedra. The Y(2)-O(2) bond length is 2.15 Å. There is one shorter (2.30 Å) and one longer (2.32 Å) Y(2)-O(5) bond length. There are a spread of Y(2)-O(3) bond distances ranging from 2.30-2.51 Å. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted T-shaped geometry to one O(1), one O(4), and one O(5) atom. The Hg(1)-O(1) bond length is 2.06 Å. The Hg(1)-O(4) bond length is 2.50 Å. The Hg(1)-O(5) bond length is 2.13 Å. In the second Hg site, Hg(2) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. The Hg(2)-O(2) bond length is 2.61 Å. The Hg(2)-O(3) bond length is 2.08 Å. The Hg(2)-O(4) bond length is 2.04 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Y(1) and one Hg(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Y(2), two equivalent Y(1), and one Hg(2) atom. In the third O site, O(3) is bonded to three equivalent Y(2) and one Hg(2) atom to form a mixture of corner and edge-sharing OY3Hg trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Y(1), one Hg(1), and one Hg(2) atom. In the fifth O site, O(5) is bonded to one Y(1), two equivalent Y(2), and one Hg(1) atom to form a mixture of corner and edge-sharing OY3Hg trigonal pyramids.