Exploring Photochemical Formic Acid Dehydrogenation via Iridium Halide Complexes

Presentation Type

Poster

Presentation Type

Submission

Department

Chemistry

Major

Biology, Chemistry

Abstract

Pentamethylcyclopentadienyl iridium bipyridine halide complexes have been demonstrated to act as effective catalysts in the photochemical dehydrogenation of formic acid for the production of H2 gas – an increasingly important resource in many sectors. We explored the impact of the halide ligand on homogenous photochemical formic acid dehydrogenation by expanding the scope of our catalysts to conduct comparisons of [Cp*Ir(bpy-CO2H)Br][Br], [Cp*Ir(bpy-CO2H)I][I], and [Cp*Ir(bpy-CO2H)Cl][Cl] along with the parent complex [Cp*Ir(bpy)Cl][Cl]. The equilibrium between the hydrogenation and dehydrogenation reactions is investigated by comparison of gas production monitored via eudiometer and by pressor sensor in a closed system. Heterogeneous catalysts have advantages over homogenous systems in regard to ease of separation from the reaction mixture and potential for catalyst recyclability. We developed a design for a heterogenous catalyst system achieved by tethering of [Cp*Ir(bpy-CO2H)Cl][Cl] to an amine-modified silica-based support resin. The immobilized catalyst was characterized by attenuated total reflectance infrared spectroscopy (ATR-IR) and its activity is compared with the homogeneous system.

Faculty Mentor

Dr. Kelsey Brereton

Funding Source or Research Program

Undergraduate Research Fellowship

Location

Waves Cafeteria

Start Date

22-3-2024 1:30 PM

End Date

22-3-2024 2:30 PM

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Mar 22nd, 1:30 PM Mar 22nd, 2:30 PM

Exploring Photochemical Formic Acid Dehydrogenation via Iridium Halide Complexes

Waves Cafeteria

Pentamethylcyclopentadienyl iridium bipyridine halide complexes have been demonstrated to act as effective catalysts in the photochemical dehydrogenation of formic acid for the production of H2 gas – an increasingly important resource in many sectors. We explored the impact of the halide ligand on homogenous photochemical formic acid dehydrogenation by expanding the scope of our catalysts to conduct comparisons of [Cp*Ir(bpy-CO2H)Br][Br], [Cp*Ir(bpy-CO2H)I][I], and [Cp*Ir(bpy-CO2H)Cl][Cl] along with the parent complex [Cp*Ir(bpy)Cl][Cl]. The equilibrium between the hydrogenation and dehydrogenation reactions is investigated by comparison of gas production monitored via eudiometer and by pressor sensor in a closed system. Heterogeneous catalysts have advantages over homogenous systems in regard to ease of separation from the reaction mixture and potential for catalyst recyclability. We developed a design for a heterogenous catalyst system achieved by tethering of [Cp*Ir(bpy-CO2H)Cl][Cl] to an amine-modified silica-based support resin. The immobilized catalyst was characterized by attenuated total reflectance infrared spectroscopy (ATR-IR) and its activity is compared with the homogeneous system.