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Isocyanate Route to Tungsten(VI) Imido Fluorido Complexes.

Melanie Riethmann1, Leonhard Eyßelein1, Janis Walpuski1

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This study introduces a new synthetic method for tungsten(VI) organoimido fluorido complexes using organo isocyanates and tungsten(VI) oxo tetrafluoride. The developed route provides access to diverse imido complexes and their derivatives.

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Area of Science:

  • Inorganic Chemistry
  • Organometallic Chemistry
  • Fluorine Chemistry

Background:

  • Tungsten(VI) complexes are crucial in catalysis and materials science.
  • Development of novel synthetic routes for organoimido complexes is essential for expanding their applications.

Purpose of the Study:

  • To establish a general synthetic strategy for tungsten(VI) organoimido fluorido complexes.
  • To explore the reactivity and derivatization of these novel complexes.

Main Methods:

  • Metathesis reaction between organo isocyanates and tungsten(VI) oxo tetrafluoride (WOF4) or its acetonitrile adduct [WOF4(MeCN)].
  • Reactions conducted in acetonitrile (MeCN) or tetrahydrofuran (THF) at 100 °C.
  • Isolation and characterization of resulting imido complexes and their solvent adducts.

Main Results:

  • Successful synthesis of various tungsten(VI) organoimido fluorido complexes, including mononuclear and dinuclear species.
  • Demonstrated facile replacement of solvent ligands with pyridine or benzophenone.
  • Preparation of tungstate(VI) imido pentafluorido salts via reaction with fluoride sources.

Conclusions:

  • A versatile synthetic route for tungsten(VI) organoimido fluorido complexes has been developed.
  • The synthesized complexes exhibit tunable properties through ligand modification.
  • This work expands the scope of organoimido tungsten chemistry and provides access to new classes of compounds.