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
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.