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Preparation and Structural Characterization of Nickel(II) Catecholates.

Christian Brückner1, Dana L. Caulder, Kenneth N. Raymond

  • 1Department of Chemistry, University of California at Berkeley, Berkeley, California 94720-1460.

Inorganic Chemistry
|October 24, 2001
PubMed
Summary

This study details the synthesis and characterization of nickel(II) catecholate complexes, revealing distinct octahedral and square-planar structures. These structures are influenced by solvent coordination and temperature, impacting their physical and chemical properties.

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Area of Science:

  • Coordination Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Early literature on nickel(II) catecholate complexes primarily focused on high-spin octahedral and low-spin square-planar geometries.
  • Octahedral complexes typically involve coordinated solvent molecules, while square-planar complexes are generally anhydrous.
  • Understanding the structural and electronic properties of these complexes is crucial for their potential applications.

Purpose of the Study:

  • To synthesize and characterize novel paramagnetic octahedral and diamagnetic square-planar nickel(II) catecholate complexes.
  • To investigate the influence of solvent coordination and temperature on the formation of different nickel(II) catecholate geometries.
  • To elucidate the physical, chemical, and crystallographic properties of the synthesized complexes.

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Main Methods:

  • Synthesis of octahedral nickel(II) complex Na(2)[trans-(H(2)O)(2)(cat)(2)Ni(II)].12H(2)O (1a) and square-planar complex Na(2)[(cat)(2)Ni(II)].2DMF (2).
  • Characterization using physical property measurements (magnetic susceptibility) and chemical property analysis.
  • X-ray crystallography for detailed structural determination of both complexes.

Main Results:

  • Successful synthesis of a paramagnetic octahedral Ni(II) complex (1a) and a diamagnetic square-planar Ni(II) complex (2).
  • Octahedral complex 1a features coordinated water molecules with average Ni-O distances of 2.044(3) Å (catecholate) and 2.162(3) Å (water).
  • Square-planar complex 2, formed under higher temperatures or weaker solvation, exhibits an average Ni-O(catecholate) distance of 1.863(3) Å.
  • X-ray crystal structures confirmed the centrosymmetric nature of both complexes and provided detailed unit cell dimensions and space group information (1a: C2/c; 2: P2(1)/m).

Conclusions:

  • The coordination geometry of nickel(II) catecholate complexes is sensitive to solvent availability and temperature.
  • Octahedral complexes incorporate solvent molecules, leading to longer Ni-O bond lengths compared to anhydrous square-planar complexes.
  • The study provides a comprehensive understanding of the structural diversity and properties of Ni(II) catecholates.