Lithium perbromate monohydrate at 296 and 173 K

Area of Science:

• Inorganic Chemistry
• Crystallography
• Solid-State Chemistry

Background:

• The synthesis and structural characterization of novel inorganic compounds are crucial for understanding chemical bonding and material properties.
• Lithium salts, particularly those containing oxyanions, are of interest due to their diverse applications and structural complexities.
• Isomorphism provides a framework for comparing and predicting structural features across related chemical compounds.

Purpose of the Study:

• To determine the crystal structure of lithium tetraoxobromate monohydrate (LiBrO4.-H2O).
• To investigate the coordination environment of lithium ions and the geometry of the perbromate anion.
• To analyze the hydrogen bonding network and compare it with related alkali metal salts.

Main Methods:

• Single-crystal X-ray diffraction was employed to elucidate the crystal structure of LiBrO4.-H2O at different temperatures.
• Rietveld refinement was used to analyze the crystallographic data and determine atomic positions and thermal parameters.
• Analysis of bond distances, angles, and coordination polyhedra provided insights into the structural characteristics.

Main Results:

• Lithium tetraoxobromate monohydrate (LiBrO4.-H2O) was found to be isomorphic with NaBrO4.H2O and NaClO4.H2O.
• The structure features two inequivalent lithium ions, each octahedrally coordinated by six oxygen atoms, forming distorted polyhedra.
• The perbromate ion exhibits near-tetrahedral geometry, and the hydrogen bonding is more extensive than in its sodium analogs.

Conclusions:

• The structural study confirms the isomorphism of LiBrO4.-H2O with related compounds, providing a basis for comparative analysis.
• The observed coordination and geometric parameters offer insights into the bonding and stability of the lithium perbromate system.
• The detailed hydrogen bonding analysis highlights the influence of the lithium cation on the hydration structure.