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Structure of hexaaquanickel(II) bromate.

A C Blackburn1, J C Gallucci, R E Gerkin

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

Acta Crystallographica. Section C, Crystal Structure Communications
|September 15, 1991
PubMed
Summary
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This study details the crystal structure of hexaaquanickel(II) bromate, revealing nickel coordinated by water molecules in an octahedral array and insights into hydrogen bonding between water and bromate ions.

Area of Science:

  • Inorganic Chemistry
  • Crystallography
  • Solid-State Chemistry

Background:

  • Hexaaquanickel(II) bromate is an inorganic salt with potential applications in materials science.
  • Understanding its crystal structure is crucial for predicting its physical and chemical properties.
  • Previous studies have characterized related hexaaquanickel(II) and hexaaquacobalt(II) salts.

Purpose of the Study:

  • To determine the precise crystal structure of hexaaquanickel(II) bromate.
  • To analyze the coordination environment of the nickel ion and the geometry of the bromate ion.
  • To investigate the hydrogen bonding network within the crystal lattice.

Main Methods:

  • Single-crystal X-ray diffraction was employed to collect diffraction data.
  • The crystal structure was solved and refined using standard crystallographic techniques.

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  • Analysis of bond lengths, bond angles, and atomic positions provided structural details.

    • Main Results:

    • The crystal structure was determined to be cubic with space group Pa3.
    • Nickel ions are octahedrally coordinated by six water molecules at a distance of 2.061(2) A.
    • The bromate ion exhibits a Br-O bond length of 1.655(2) A and an O-Br-O angle of 104.25(9) degrees.
    • Rigid-body motion was observed for both the nickel-oxygen complex and the bromate ion.
    • Hydrogen bonding primarily occurs between the water oxygen atoms and the bromate groups.

    Conclusions:

    • The crystal structure of hexaaquanickel(II) bromate has been fully elucidated.
    • The structural data provides a basis for understanding its chemical behavior and potential applications.
    • The observed hydrogen bonding network influences the overall crystal packing and stability.