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Mononuclear, hexanuclear and polymeric indium(III) pyrazolido complexes; structural characterization, dynamic

Susana Herrera1, Kennett I Rivero2, Alexis Guzmán2

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New indium(III) complexes featuring pyrazole ligands were synthesized and characterized. These complexes exhibit fluxional behavior and form novel hexanuclear and polymeric structures with interesting luminescent properties.

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Area of Science:

  • Coordination Chemistry
  • Inorganic Synthesis
  • Materials Science

Background:

  • Indium(III) complexes are of interest due to their diverse applications.
  • Pyrazole ligands offer versatile coordination modes and tunable electronic properties.

Purpose of the Study:

  • To synthesize and characterize novel mononuclear, hexanuclear, and polymeric indium(III)-pyrazole complexes.
  • To investigate the fluxional behavior and luminescent properties of these new indium(III) compounds.

Main Methods:

  • Synthesis of indium(III) complexes via addition reactions.
  • Crystallographic characterization (single crystal X-ray diffraction).
  • Variable temperature 1H NMR spectroscopy to study fluxional behavior.
  • Luminescence and lifetime calculations for polymeric complexes.

Main Results:

  • Six mononuclear indium(III) complexes with pyrazole ligands were synthesized and characterized.
  • Complex fluxional behavior attributed to proton transfer, ligand exchange, and tautomerization was observed.
  • Three novel hexanuclear indium(III) complexes with hydroxo and oxo bridges were obtained.
  • Multicolour emitting polymeric indium(III) complexes were synthesized under varying solvent conditions.

Conclusions:

  • The study successfully synthesized and characterized a new family of indium(III)-pyrazole complexes.
  • The research provides insights into the dynamic behavior and structural diversity of these indium(III) compounds.
  • The luminescent properties of the polymeric complexes suggest potential applications in materials science.