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HgO crystallizes in the orthorhombic Pnma space group. The structure is one-dimensional and consists of two HgO ribbons oriented in the (0, 0, 1) direction. Hg2+ is bonded in a distorted linear geometry to two equivalent O2- atoms. There are one shorter (2.06 Å) and one longer (2.07 Å) Hg–O bond lengths. O2- is bonded in a distorted water-like geometry to two equivalent Hg2+ atoms.
HgO2 crystallizes in the monoclinic C2/m space group. The structure is one-dimensional and consists of two HgO2 ribbons oriented in the (1, 0, 1) direction. Hg is bonded in a linear geometry to two equivalent O atoms. Both Hg–O bond lengths are 2.12 Å. O is bonded in a distorted water-like geometry to one Hg and one O atom. The O–O bond length is 1.48 Å.
HgO is Halite, Rock Salt structured and crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. Hg2+ is bonded to six equivalent O2- atoms to form a mixture of edge and corner-sharing HgO6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. There are a spread of Hg–O bond distances ranging from 2.44–2.49 Å. O2- is bonded to six equivalent Hg2+ atoms to form a mixture of edge and corner-sharing OHg6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°.
HgO crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Hg2+ sites. In the first Hg2+ site, Hg2+ is bonded in a distorted linear geometry to two O2- atoms. Both Hg–O bond lengths are 2.06 Å. In the second Hg2+ site, Hg2+ is bonded in a distorted linear geometry to two O2- atoms. Both Hg–O bond lengths are 2.06 Å. In the third Hg2+ site, Hg2+ is bonded in a distorted linear geometry to six O2- atoms. There are a spread of Hg–O bond distances ranging from 2.07–2.99 Å. In the fourth Hg2+ site, Hg2+ is bonded in a distorted linear geometry to two O2- atoms. Both Hg–O bond lengths are 2.07 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted water-like geometry to three Hg2+ atoms. In the second O2- site, O2- is bonded in a distorted water-like geometry to two Hg2+ atoms. In the third O2- site, O2- is bonded in a distorted water-like geometry to four Hg2+ atoms. In the fourth O2- site, O2- is bonded in a distorted water-like geometry to three Hg2+ atoms.
HgO2 crystallizes in the orthorhombic Pbca space group. The structure is one-dimensional and consists of four HgO2 ribbons oriented in the (1, 0, 0) direction. Hg is bonded in a linear geometry to two equivalent O atoms. Both Hg–O bond lengths are 2.13 Å. O is bonded in a 2-coordinate geometry to one Hg and one O atom. The O–O bond length is 1.48 Å.
HgO2 crystallizes in the monoclinic C2/m space group. The structure is one-dimensional and consists of two HgO2 ribbons oriented in the (1, 0, 1) direction. Hg is bonded in a linear geometry to two equivalent O atoms. Both Hg–O bond lengths are 2.11 Å. O is bonded in a distorted water-like geometry to one Hg and one O atom. The O–O bond length is 1.48 Å.
HgO is Cinnabar structured and crystallizes in the trigonal P3_121 space group. The structure is one-dimensional and consists of one HgO ribbon oriented in the (0, 0, 1) direction. Hg2+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both Hg–O bond lengths are 2.07 Å. O2- is bonded in a distorted water-like geometry to two equivalent Hg2+ atoms.