K2[O(HgSO3)3], a new sulfitomercurate with an [OHg3] core

Area of Science:

• Inorganic Chemistry
• Crystal Structure Analysis
• Coordination Chemistry

Background:

• Mercury-sulfur compounds exhibit diverse coordination chemistries.
• Understanding complex mercury anions is crucial for materials science and environmental studies.
• Previous research has not detailed the specific structure of mu(3)-oxido-trimercurate complexes.

Purpose of the Study:

• To elucidate the detailed crystal structure of dipotassium mu(3)-oxido-tris[sulfitomercurate(II)], K(2)[O(HgSO(3))(3)].
• To characterize the coordination environment of mercury and potassium ions within the crystal lattice.
• To identify novel structural motifs in mercury-sulfur coordination complexes.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the atomic arrangement.
• Crystallographic data were analyzed to identify bond lengths, angles, and coordination polyhedra.
• Structural features were compared with known mercury coordination compounds.

Main Results:

• The crystal structure features layered segregation of K(+) cations and [O(HgSO(3))(3)](2-) anions.
• A novel mu(3)-oxido-trimercurate anion with a central [OHg(3)] core, adopting a flat pyramidal shape, was identified.
• Mercury atoms exhibit coordination to oxygen and sulfur, with intermolecular O...Hg interactions influencing geometry.
• Potassium cations are coordinated by nine oxygen atoms, forming a distorted tricapped trigonal prism.

Conclusions:

• The study presents the first detailed structural characterization of dipotassium mu(3)-oxido-tris[sulfitomercurate(II)].
• The discovery of the [OHg(3)] core represents a new structural motif in mercury chemistry.
• The findings contribute to the understanding of mercury-sulfur coordination complexes and their structural diversity.