Oxy-tethered Cp*Ir(III) complex as a competent catalyst for selective dehydrogenation from formic acid

Area of Science:

• Organometallic Chemistry
• Catalysis
• Sustainable Chemistry

Background:

• Catalytic hydrogen generation from formic acid is crucial for clean energy.
• Developing stable and efficient catalysts remains a challenge.
• Iridium complexes show promise but often suffer from deactivation.

Purpose of the Study:

• To synthesize a novel bifunctional tethered iridium catalyst.
• To investigate its performance in hydrogen generation from formic acid.
• To understand how structural constraints impact catalyst stability and activity.

Main Methods:

• Synthesis of a bifunctional iridium catalyst featuring a 1,2-diphenylethylenediamine framework.
• Construction of an ethereal tether chain via intramolecular oxydefluorination.
• Utilizing a modified 1,2,3,4,5-pentamethylcyclopentadienyl ligand.
• Catalytic testing for hydrogen generation from formic acid.

Main Results:

• The catalyst was successfully synthesized for the first time.
• The conformationally constrained structure effectively hindered deactivation pathways.
• Achieved advanced catalyst durability and complete conversion of formic acid.
• Demonstrated high efficiency in catalytic hydrogen generation.

Conclusions:

• The novel tethered iridium catalyst offers superior stability and activity.
• Structural design is key to overcoming catalyst deactivation.
• This work provides a promising platform for efficient formic acid-based hydrogen production.