A ratiometric substrate for rapid evaluation of transfer hydrogenation efficiency in solution

Area of Science:

• Organometallic Chemistry
• Catalysis
• Photochemistry

Background:

• Transfer hydrogenation is a crucial reaction in organic synthesis, often catalyzed by iridium complexes.
• Developing efficient methods for screening and optimizing these catalysts is essential for synthetic chemists.
• Photoluminescent probes offer sensitive detection but require careful design for specific applications.

Purpose of the Study:

• To design and synthesize a novel cyclometalated iridium(III) complex.
• To utilize this complex as a ratiometric photoluminescent probe for transfer hydrogenation studies.
• To establish a rapid and convenient method for screening iridium catalyst activity.

Main Methods:

• Synthesis of a cyclometalated iridium(III) complex incorporating a self-immolative quinolinium unit.
• Utilizing the complex as a substrate in transfer hydrogenation reactions.
• Employing a microplate reader for quantitative assessment of catalyst activity via photoluminescence.

Main Results:

• The developed iridium(III) complex functions effectively as a ratiometric substrate.
• The photoluminescent probe allows for rapid screening of diverse iridium catalysts.
• The method requires minimal catalyst sample, enhancing efficiency and reducing waste.

Conclusions:

• A novel photoluminescent iridium(III) probe has been successfully developed for transfer hydrogenation.
• This probe provides a convenient and efficient platform for high-throughput screening of iridium catalysts.
• The methodology facilitates the assessment of catalyst activity with minimal sample requirements.