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Organometallic Ir(III) complexes: post-synthetic modification, photophysical properties and binuclear complex
Anastasia Yu Gitlina1, Viktoria Khistiaeva2, Alexey Melnikov3
1Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.
Dalton Transactions (Cambridge, England : 2003)
|June 19, 2023
Summary
Post-synthetic modification of iridium(III) complexes enabled controlled synthesis of novel binuclear complexes. These functionalized complexes exhibit unique luminescent properties, offering new avenues in materials science.
Area of Science:
- Coordination Chemistry
- Organometallic Chemistry
- Materials Science
Background:
- Iridium(III) complexes are versatile platforms for developing functional materials.
- Post-synthetic modification offers a powerful strategy for precise molecular construction.
- Understanding the interplay between linked metal centers is crucial for designing advanced materials.
Purpose of the Study:
- To functionalize iridium(III) complexes using Suzuki coupling and copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) click chemistry.
- To demonstrate the utility of post-synthetic modification in constructing di-di and di-f binuclear complexes.
- To investigate the photophysical properties and luminescence mechanisms of the resulting mono- and binuclear systems.
Main Methods:
- Synthesis and characterization of functionalized iridium(III) complexes.
- Application of Suzuki coupling and CuAAC click reactions for creating binuclear structures.
- Spectroscopic techniques including NMR, FTIR, XPS, and NEXAFS spectroscopy.
- Single crystal X-ray diffraction for structural elucidation.
- Photophysical property measurements and Time-Dependent Density Functional Theory (TDDFT) calculations.
Main Results:
- Successful synthesis of functionalized iridium(III) complexes with a second selective donor site.
- Demonstrated controlled construction of di-di and di-f binuclear complexes via post-synthetic modification.
- Confirmed coordination of the diimine donor site to lanthanide(III) centers using XPS and NEXAFS.
- Detailed investigation of photophysical properties, showing evolution of luminescence upon binuclear complex formation.
Conclusions:
- Post-synthetic modification is an effective strategy for building complex multinuclear metal systems.
- The synthesized binuclear complexes exhibit tunable luminescent characteristics.
- TDDFT calculations support the experimental findings regarding luminescence mechanisms.
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