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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Fluorine Chemistry

Background:

  • Nickel complexes with fluoroalkyl ligands are important in catalysis and materials science.
  • Understanding ligand exchange and redox behavior is crucial for designing new nickel compounds.

Purpose of the Study:

  • To investigate the reaction of tetramethylammonium acetate with specific nickel-fluoroalkyl complexes.
  • To elucidate the factors controlling acetate ligand addition and complex speciation.
  • To explore the oxidation of a nickel complex in the presence of acetate.

Main Methods:

  • 19F NMR spectroscopy was used to monitor the interactions.
  • EPR spectroscopy was employed to characterize the paramagnetic Ni(III) complex.

Main Results:

  • Acetate ligands replace MeCN ligands on the nickel center, with the number of bound acetates depending on the fluoroalkyl ligand and acetate concentration.
  • The formation of monomers or dimers is dictated by the fluoroalkyl ligand.
  • Oxidation of [(MeCN)2Ni(CF3)2] with acetate yields the octahedral Ni(III) complex [NMe4][Ni(CF3)2(OAc)2].

Conclusions:

  • The nature of the fluoroalkyl ligand is a key determinant in the coordination chemistry of these nickel complexes.
  • The study provides insights into the synthesis and characterization of novel nickel-acetate and nickel(III) complexes.