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Related Experiment Videos

Structure of sodium perbromate monohydrate.

A C Blackburn1, J C Gallucci, R E Gerkin

  • 1Department of Chemistry, Ohio State University, Columbus 43210.

Acta Crystallographica. Section C, Crystal Structure Communications
|March 15, 1992
PubMed
Summary

This study details the crystal structure of sodium perbromate monohydrate, revealing insights into its atomic arrangement and bonding. The findings clarify the geometry of the perbromate ion and sodium coordination, differing slightly from related compounds.

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Solid-State Chemistry

Background:

  • Sodium perbromate monohydrate (NaBrO4.H2O) is an inorganic salt with potential applications.
  • Understanding its crystal structure is crucial for predicting its physical and chemical properties.
  • Previous studies on isomorphic compounds like sodium perchlorate monohydrate provide a basis for comparison.

Purpose of the Study:

  • To determine the precise crystal structure of sodium perbromate monohydrate.
  • To analyze the coordination environment of sodium ions and the geometry of the perbromate ion.
  • To investigate hydrogen bonding and compare it with sodium perchlorate monohydrate.

Main Methods:

  • Single-crystal X-ray diffraction was employed to collect diffraction data.

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  • The crystal structure was solved and refined using standard crystallographic techniques.
  • Analysis included bond distances, angles, and thermal motion to understand atomic interactions.

    • Main Results:

    • The crystal structure was solved in the monoclinic space group C2/c with Z=8.
    • Two inequivalent sodium ions are each coordinated by six oxygen atoms, forming distorted octahedra.
    • The perbromate ion exhibits near-tetrahedral geometry, with average Br-O bond lengths and O-Br-O angles consistent with literature values.
    • Hydrogen bonding analysis revealed subtle differences compared to sodium perchlorate monohydrate.
    • Evidence for dynamic disordering of hydrogen atoms, observed in sodium perchlorate monohydrate, was not clearly indicated.

    Conclusions:

    • The crystal structure of sodium perbromate monohydrate has been accurately determined.
    • The perbromate ion displays rigid-body behavior, while sodium coordination polyhedra do not.
    • Hydrogen bonding patterns differ slightly from the isomorphic sodium perchlorate monohydrate.
    • X-ray diffraction did not provide clear evidence for the dynamic disordering of hydrogen atoms observed via magnetic resonance in the perchlorate analogue.