Hg(3)AlF(6)O(2)H, a structure with a short interpolyhedral O...O distance

Area of Science:

• Inorganic Chemistry
• Crystallography
• Materials Science

Background:

• Understanding the atomic arrangement and bonding in complex inorganic compounds is crucial for predicting their properties.
• The crystal structure of mercury-aluminum-fluoride-oxide-hydrates provides insights into coordination chemistry and hydrogen bonding.

Purpose of the Study:

• To elucidate the crystal structure of Hg(3)AlF(6)O(2)H (trimercury(II) aluminium hydrogen hexafluoride dioxide).
• To analyze the coordination environments of mercury and aluminum atoms.
• To investigate the role of hydrogen atoms in the crystal structure and hydrogen bonding.

Main Methods:

• Single-crystal X-ray diffraction analysis was used to determine the atomic positions and unit cell parameters.
• Crystal chemical arguments were employed to deduce the probable location of hydrogen atoms.
• Analysis of bond distances and angles to characterize coordination polyhedra.

Main Results:

• The crystal structure is based on a distorted cubic close-packed arrangement of metal atoms (75% Hg, 25% Al).
• Distinct [HgO(2)F(6)] polyhedra and nearly ideal [AlF(6)] octahedra were identified.
• Hydrogen atoms participate in O-H.O hydrogen bonds with an O.O distance of 2.562 (9) Å.

Conclusions:

• The study provides a detailed description of the crystal structure of Hg(3)AlF(6)O(2)H.
• The coordination of metal ions and the presence of hydrogen bonds significantly influence the compound's structure.
• This work contributes to the understanding of complex inorganic structures containing mercury, aluminum, oxygen, and fluorine.