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Related Experiment Videos

Structure of hexaaquacobalt(II) bromate.

A C Blackburn1, J C Gallucci, R E Gerkin

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

Acta Crystallographica. Section B, Structural Science
|December 1, 1990
PubMed
Summary

The crystal structure of hexa-aquacobalt(II) bromate was determined using X-ray diffraction. This study reveals details of the coordination environment, hydrogen bonding, and structural isomorphism with related metal salts.

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Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Materials Science

Background:

  • Hexa-aquacobalt(II) bromate, [Co(H2O)6](BrO3)2, is a coordination compound with potential applications in materials science.
  • Understanding the precise crystal structure is crucial for predicting and controlling its physical and chemical properties.

Purpose of the Study:

  • To elucidate the detailed crystal structure of hexa-aquacobalt(II) bromate.
  • To analyze the coordination geometry around the cobalt(II) ion and the structure of the bromate anion.
  • To investigate the hydrogen bonding network within the crystal lattice.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the crystal structure.
  • The crystal system, space group, and lattice parameters were identified.

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  • Atomic coordinates and thermal parameters were refined to high accuracy (R=0.027).

    • Main Results:

    • The compound crystallizes in a cubic system with space group Pa-3.
    • Cobalt(II) ions are octahedrally coordinated by six water molecules at a distance of 2.095(2) Å.
    • The bromate anion exhibits a Br-O bond length of 1.653(2) Å and an O-Br-O angle of 104.07(9)°.
    • Hydrogen bonding occurs between water oxygen atoms and bromate groups, with the cobalt-oxygen complex showing rigid-body behavior.

    Conclusions:

    • The detailed crystal structure of hexa-aquacobalt(II) bromate was successfully determined.
    • The findings provide insights into the coordination chemistry and intermolecular interactions in this compound.
    • The structure is isomorphic to hexa-aquanickel(II) chlorate, suggesting similar packing motifs in related compounds.