Time-Resolved Mechanistic Depiction of Photoinduced CO 2 Reduction Catalysis on a Urea-Modified Iron Porphyrin.
Daniel H Cruz NetoEva PugliesePhilipp GoticoAnnamaria QuarantaWinfried LeiblKarine SteenkesteDaniel PeláezThomas PinoZakaria HalimeMinh-Huong Ha-ThiPublished in: Angewandte Chemie (International ed. in English) (2024)
The development of functional artificial photosynthetic devices relies on the understanding of mechanistic aspects involved in specialized photocatalysts. Modified iron porphyrins have long been explored as efficient catalysts for the light-induced reduction of carbon dioxide (CO 2 ) towards solar fuels. In spite of the advancements in homogeneous catalysis, the development of the next generation of catalysts requires a complete understanding of the fundamental photoinduced processes taking place prior to and after activation of the substrate by the catalyst. In this work, we employ a state-of-the-art nanosecond optical transient absorption spectroscopic setup with a double excitation capability to induce charge accumulation and trigger the reduction of CO 2 to carbon monoxide (CO). Our biomimetic system is composed of a urea-modified iron(III) tetraphenylporphyrin (UrFe III ) catalyst, the prototypical [Ru(bpy) 3 ] 2+ (bpy=2,2'-bipyridine) used as a photosensitizer, and sodium ascorbate as an electron donor. Under inert atmosphere, we show that two electrons can be successively accumulated on the catalyst as the fates of the photogenerated UrFe II and UrFe I reduced species are tracked. In the presence of CO 2 , the catalytic cycle is kick-started providing further evidence on CO 2 activation by the UrFe catalyst in its formal Fe I oxidation state.
Keyphrases
- visible light
- carbon dioxide
- metal organic framework
- highly efficient
- electron transfer
- photodynamic therapy
- room temperature
- ionic liquid
- iron deficiency
- reduced graphene oxide
- energy transfer
- molecular docking
- palliative care
- high resolution
- nitric oxide
- transition metal
- solar cells
- gold nanoparticles
- blood brain barrier
- amino acid
- hydrogen peroxide
- genetic diversity
- subarachnoid hemorrhage
- mass spectrometry
- molecular dynamics simulations
- structural basis
- crystal structure