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Ligand-Driven Structural and Photophysical Modulation in Iridium(III) Complexes: Design, Synthesis, and Applications

Yuluan Liao1, Lianxiang Li1, Liangchen Liu1

  • 1Institutes of Molecular Engineering and Applied Chemistry, Anhui University of Technology, Ma'anshan 243002, P. R. China.

Inorganic Chemistry
|October 7, 2025
PubMed
Summary

Researchers designed novel iridium(III) complexes with piperazine-functionalized pyridine ligands. These complexes show tunable photophysical properties, indicating potential for optoelectronic devices like organic light-emitting diodes (OLEDs).

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Photophysics

Background:

  • Iridium(III) complexes are crucial in optoelectronics.
  • Ligand design significantly influences complex properties.
  • Understanding structure-property relationships is key for material development.

Purpose of the Study:

  • To synthesize and characterize novel iridium(III) complexes with piperazine-functionalized pyridine ligands.
  • To investigate the impact of ligand structure on the solid-state packing and photophysical properties.
  • To explore the potential of these complexes in UV-driven optoelectronic applications.

Main Methods:

  • Rational design and synthesis of six iridium(III) complexes (Ir-1 to Ir-6).
  • Single-crystal X-ray diffraction for structural analysis.
  • UV-vis and fluorescence spectroscopy for photophysical characterization.

Main Results:

  • Distinct crystal packing patterns observed, influenced by ligand rigidity and intermolecular interactions.
  • Ligand modification led to tunable electronic properties and red-shifted absorption/emission.
  • Complex Ir-6 exhibited strong emission (∼300,000 au at 330 nm) with red-shifted absorption (λabs = 395 nm).
  • Emission maxima red-shifted from 280 nm (Ir-1) to 330 nm (Ir-6), correlating with ligand rigidity and MLCT character.

Conclusions:

  • The study demonstrates successful ligand-induced structural and photophysical tuning in iridium(III) complexes.
  • These complexes possess excellent thermal stability and scalable synthesis.
  • The tunable properties make them promising candidates for photocatalysis and organic light-emitting diodes (OLEDs).