A5037238529- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Catalytic C–H Functionalization Methods
- Radical Photochemical Reactions
- Sulfur-Based Synthesis Techniques
- Advanced Photocatalysis Techniques
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Organic Light-Emitting Diodes Research
- Organometallic Complex Synthesis and Catalysis
- Conducting polymers and applications
- Ammonia Synthesis and Nitrogen Reduction
- Catalytic Cross-Coupling Reactions
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Porphyrin and Phthalocyanine Chemistry
- CO2 Reduction Techniques and Catalysts
- Photochemistry and Electron Transfer Studies
Uppsala University
2022-2025
Imperial College London
2023
Abstract The power conversion efficiency of ternary organic solar cells (TOSCs), consisting one host binary blend and guest component, remains limited by large voltage losses. fundamental understanding the open-circuit ( V OC ) in TOSCs is controversial, limiting rational design component. In this study, we systematically investigate how component affects radiative non-radiative related parts a series using detailed balanced principle. We highlight that thermal population charge-transfer...
An iron complex with N-heterocyclic carbene ligands engages in efficient photoredox catalysis via excited state electron transfer reactions of its Fe( ii ) and iii oxidation states.
Herein we report the first high turnover photocatalytic hydrogen formation reaction based on an earth-abundant FeIII-NHC photosensitiser. The occurs via reductive quenching of 2LMCT excited state that can be directly with green light and employs either Pt-colloids or [Co(dmgH)2pyCl] as proton reduction catalysts [HNEt3][BF4] triethanolamine/triethylamine electron donors. outstanding photostability complex enables numbers >1000 without degradation.
Fe(III) complexes with N-heterocyclic carbene (NHC) ligands belong to the rare examples of Earth-abundant transition metal long-lived luminescent charge-transfer excited states that enable applications as photosensitizers for charge separation reactions. We report three new hexa-NHC this class: [Fe(brphtmeimb)2]PF6 (brphtmeimb = [(4-bromophenyl)tris(3-methylimidazol-2-ylidene)borate]–, [Fe(meophtmeimb)2]PF6 (meophtmeimb [(4-methoxyphenyl)tris(3-methylimidazol-2-ylidene)borate]–, and...
Iron N-heterocyclic carbene (FeNHC) complexes with long-lived charge transfer states are emerging as a promising class of photoactive materials. We have synthesized [FeII(ImP)2] (ImP = bis(2,6-bis(3-methylimidazol-2-ylidene-1-yl)phenylene)) that combines ligands cyclometalation for additionally improved ligand field strength. The 9 ps lifetime its 3MLCT (metal-to-ligand transfer) state however reveals no benefit from compared to Fe(ii) NHC/pyridine or pure NHC sets. In acetonitrile solution,...
Electron transfer to the 2 LMCT state of a photoactive complex based on Earth-abundant iron has been used drive photocatalytic aminomethylation reactions by generation α-aminoalkyl radicals and underlying mechanism investigated.
An Fe( ii ) complex bearing tris(carbene)borate ligands with imidazol-2-ylidene donors shows marked destabilization of metal centered states by the strongly σ-donating ligands. Yet, its high-energy 3 MLCT state is rapidly deactivated via a MC state.
An Fe(III)‐NHC complex has been employed for the green light driven catalysis of base‐promoted homolytic aromatic substitution (BHAS) reactions. Tributylamine was used as a sacrificial electron donor, together with potassium carbonate base in dimethyl sulfoxide solvent. In contrast to previously studied photocatalysts, excited is not reducing arylhalide substrates. Instead, latter are activated by α‐aminoalkyl radicals formed upon reductive quenching photocatalyst tributylamine. Avoiding...
Symmetry-breaking charge separation in molecular materials has attracted increasing attention for optoelectronics based on single-material active layers. To this end, Fe(III) complexes with particularly electron-donating N-heterocyclic carbene ligands offer interesting properties a 2LMCT excited state capable of oxidizing or reducing the complex its ground state. In Communication, we show that corresponding symmetry-breaking occurs amorphous films pristine [Fe(III)L2]PF6 (L =...