Cyclometalated iridium complexes based on monodentate aminophosphanes

Area of Science:

• Organometallic Chemistry
• Catalysis
• Coordination Chemistry

Background:

• Aminophosphanes are versatile ligands in organometallic chemistry.
• Iridium complexes are known for their catalytic applications.

Purpose of the Study:

• To synthesize novel iridium complexes using monodentate aminophosphanes.
• To investigate the catalytic activity of these complexes in formic acid dehydrogenation.

Main Methods:

• Reaction of aminophosphanes (HNP, SiMe3NP) with iridium precursors ([Ir(μ-Cl)(cod)]2, [Ir(CH3CN)2(cod)][PF6], [Ir(CH3CN)2(coe)2][PF6]).
• Characterization of resulting complexes using spectroscopic techniques (NMR).
• Evaluation of catalytic performance in formic acid dehydrogenation.

Main Results:

• Synthesis of tetra- and pentacoordinate iridium complexes.
• Formation of cyclometalated iridium(III)-hydride derivatives.
• Identification of [IrCl(HNP)2(cod)] as a highly active catalyst for formic acid dehydrogenation (TOF ~2300 h-1).

Conclusions:

• Novel iridium-aminophosphane complexes were successfully synthesized.
• The synthesized complexes exhibit catalytic activity in formic acid dehydrogenation.
• [IrCl(HNP)2(cod)] is a promising catalyst for this transformation.