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Luminescent Bis(amidinate) Indium Complexes.

Ramkumar Kannan1, Anna Chandrasekar Murali2, Krishnan Venkatasubbaiah2

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|October 4, 2024
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New indium(III) bis-amidinate complexes were synthesized and characterized. These compounds exhibit luminescence, with one derivative showing a high quantum yield, indicating potential applications in materials science.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Indium(III) complexes are explored for their unique electronic and photophysical properties.
  • Bis-amidinate ligands offer versatile coordination environments for metal centers.

Purpose of the Study:

  • To synthesize and characterize novel bis-amidinate indium(III) monochloride complexes.
  • To investigate the structural and photophysical properties of these new indium compounds.

Main Methods:

  • Synthesis of six bis-amidinate indium(III) monochloride complexes via reaction of Li-amidinate ligands with InCl3.
  • Single crystal X-ray diffraction analysis for structural elucidation of selected compounds.
  • Photophysical property measurements (luminescence, quantum yield, lifetime) in solution.
  • Theoretical studies to support experimental observations.

Main Results:

  • Six novel bis-amidinate indium(III) monochloride complexes were successfully prepared.
  • X-ray analysis revealed a distorted trigonal bipyramidal geometry around the In(III) center with two chelating amidinate ligands.
  • Compounds 2-6 demonstrated solution-state luminescence.
  • Compound 4 exhibited a notable quantum yield of 45.5% in dichloromethane.
  • Compound 3 showed a maximum fluorescence lifetime of 11 ns.

Conclusions:

  • The synthesized bis-amidinate indium(III) complexes possess interesting structural and photophysical characteristics.
  • The observed luminescence and high quantum yield in specific derivatives suggest potential for optoelectronic applications.
  • Further theoretical and experimental investigations can optimize these properties for targeted applications.