Leif Hammarström
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View article: Correction to “Evidence for Competing Proton-Coupled Reaction Pathways of Molecular Triads in a Low-Polarity Solvent”
Correction to “Evidence for Competing Proton-Coupled Reaction Pathways of Molecular Triads in a Low-Polarity Solvent” Open
View article: Direct Evidence of Bimolecular Proton-Coupled Energy Transfer at Room Temperature
Direct Evidence of Bimolecular Proton-Coupled Energy Transfer at Room Temperature Open
A new elementary reaction, denoted proton-coupled energy transfer (PCEnT), has been recently reported in a series of donor-acceptor molecules. In this reaction, excited state energy transfer is made possible by a simultaneous transfer of a…
View article: Unraveling Bifurcating Pathways for CO and HCOOH Formation: Insights from Stopped-Flow FTIR Spectroscopy of a Second-Sphere Modified Mn Catalyst
Unraveling Bifurcating Pathways for CO and HCOOH Formation: Insights from Stopped-Flow FTIR Spectroscopy of a Second-Sphere Modified Mn Catalyst Open
Manganese bipyridine tricarbonyl complexes show high efficiency and selectivity in electrochemical CO2 reduction (e-CO2RR) to CO. Efforts to shift selectivity toward HCOOH have been made by introducing second-sphere h…
View article: A Sm(II)-based catalyst for the reduction of dinitrogen, nitrite, and nitrate to ammonia or urea
A Sm(II)-based catalyst for the reduction of dinitrogen, nitrite, and nitrate to ammonia or urea Open
Industrial dinitrogen (N2) reduction to ammonia in the Haber-Bosch synthesis is essential for producing fertilizers and, consequently, food. Methods wherein the energy for nitrogen activation is supplied by light could provide more sustain…
View article: Bio‐Inspired Self‐Assembly of Enzyme‐Micelle Systems for Semi‐Artificial Photosynthesis
Bio‐Inspired Self‐Assembly of Enzyme‐Micelle Systems for Semi‐Artificial Photosynthesis Open
Supramolecular surfactants provide a versatile platform to construct systems for solar fuel synthesis, for example via the self‐assembly of amphiphilic photosensitizers and catalysts into diverse supramolecular structures. However, the uti…
View article: Bio‐Inspired Self‐Assembly of Enzyme‐Micelle Systems for Semi‐Artificial Photosynthesis
Bio‐Inspired Self‐Assembly of Enzyme‐Micelle Systems for Semi‐Artificial Photosynthesis Open
Supramolecular surfactants provide a versatile platform to construct systems for solar fuel synthesis, for example via the self‐assembly of amphiphilic photosensitizers and catalysts into diverse supramolecular structures. However, the uti…
View article: Evidence for Competing Proton-Coupled Reaction Pathways of Molecular Triads in a Low-Polarity Solvent
Evidence for Competing Proton-Coupled Reaction Pathways of Molecular Triads in a Low-Polarity Solvent Open
The temperature dependence of concerted proton-electron transfer (CPET) reactions of two anthracene-phenol-pyridine (An-PhOH-py) triads is investigated in toluene. Light excitation forms an anthracene local excited state (1*
View article: PCET-mediated deconstructive cross-coupling of aliphatic alcohols
PCET-mediated deconstructive cross-coupling of aliphatic alcohols Open
A practical deconstructive arylation of aliphatic alcohols has been developed using a synergistic photoredox proton-coupled electron transfer (PCET) and nickel dual catalytic system.
View article: Revising exciton diffusion lengths in polymer dot photocatalysts
Revising exciton diffusion lengths in polymer dot photocatalysts Open
The study reveals that an intrinsic diffusion length of PFBT Pdots exceeds previously reported values and a quenching volume comparable to the particle core size, suggesting that efficient exciton migration to the surface is viable.
View article: Direct Detection of Key Intermediates during the Product Release in Rhenium Bipyridine-Catalyzed CO<sub>2</sub> Reduction Reaction
Direct Detection of Key Intermediates during the Product Release in Rhenium Bipyridine-Catalyzed CO<sub>2</sub> Reduction Reaction Open
Rhenium bipyridine tricarbonyl complexes, fac-[Re(bpy)(CO)(3)X](n+), are highly effective in selectively converting CO2 to CO under electrochemical and photochemical conditions. Despite numerous mechanistic studies aimed at understanding i…
View article: Excited-state proton-coupled electron transfer within ion pairs
Excited-state proton-coupled electron transfer within ion pairs Open
The use of light to drive proton-coupled electron transfer (PCET) reactions has received growing interest, with recent focus on the direct use of excited states in PCET reactions (ES-PCET). Electrostatic ion pairs provide a scaffold to red…
View article: Enter Mn<sup>IV</sup>–NHC: A Dark Photooxidant with a Long-Lived Charge-Transfer Excited State
Enter Mn<sup>IV</sup>–NHC: A Dark Photooxidant with a Long-Lived Charge-Transfer Excited State Open
Detailed photophysical investigation of a Mn(IV)-carbene complex has revealed that excitation into its lowest-energy absorption band (∼500 nm) results in the formation of an energetic ligand-to-metal charge-transfer (LMCT) state with a lif…
View article: Multi-Variable Multi-Metric Optimization of Self-Assembled Photocatalytic CO<sub>2</sub> Reduction Performance Using Machine Learning Algorithms
Multi-Variable Multi-Metric Optimization of Self-Assembled Photocatalytic CO<sub>2</sub> Reduction Performance Using Machine Learning Algorithms Open
The sunlight-driven reduction of CO2 into fuels and platform chemicals is a promising approach to enable a circular economy. However, established optimization approaches are poorly suited to multivariable multimetric photocataly…
View article: Embedding biocatalysts in a redox polymer enhances the performance of dye-sensitized photocathodes in bias-free photoelectrochemical water splitting
Embedding biocatalysts in a redox polymer enhances the performance of dye-sensitized photocathodes in bias-free photoelectrochemical water splitting Open
Dye-sensitized photoelectrodes consisting of photosensitizers and molecular catalysts with tunable structures and adjustable energy levels are attractive for low-cost and eco-friendly solar-assisted synthesis of energy rich products. Despi…
View article: Ultrafast Electron Transfer from CuInS<sub>2</sub> Quantum Dots to a Molecular Catalyst for Hydrogen Production: Challenging Diffusion Limitations
Ultrafast Electron Transfer from CuInS<sub>2</sub> Quantum Dots to a Molecular Catalyst for Hydrogen Production: Challenging Diffusion Limitations Open
Systems integrating quantum dots with molecular catalysts are attracting ever more attention, primarily owing to their tunability and notable photocatalytic activity in the context of the hydrogen evolution reaction (HER) and CO2
View article: Directed ultrafast conformational changes accompany electron transfer in a photolyase as resolved by serial crystallography
Directed ultrafast conformational changes accompany electron transfer in a photolyase as resolved by serial crystallography Open
Charge-transfer reactions in proteins are important for life, such as in photolyases which repair DNA, but the role of structural dynamics remains unclear. Here, using femtosecond X-ray crystallography, we report the structural changes tha…
View article: Realizing Symmetry-Breaking Architectures in Soap Films
Realizing Symmetry-Breaking Architectures in Soap Films Open
We show here that soap films—typically expected to host symmetric molecular arrangements—can be constructed with differing opposite surfaces, breaking their symmetry, and making them reminiscent of functional biological motifs found in nat…
View article: Switching the proton-coupled electron transfer mechanism for non-canonical tyrosine residues in a <i>de novo</i> protein
Switching the proton-coupled electron transfer mechanism for non-canonical tyrosine residues in a <i>de novo</i> protein Open
Proton-coupled electron transfer reactions of tyrosine are instrumental to many redox reactions in nature. By balancing the driving forces for electron and proton transfer, the mechanism can be changed from step-wise to concerted transfer …
View article: Access to long-lived room temperature phosphorescence through auration of 2,1,3-benzothiadiazole
Access to long-lived room temperature phosphorescence through auration of 2,1,3-benzothiadiazole Open
A series of 2,1,3-benzothiadiazole–Au( i )–L complexes have been synthesised, structurally characterised and investigated for their photophysical properties.
View article: β-Scission of Secondary Alcohols via Photosensitization: Synthetic Utilization and Mechanistic Insights
β-Scission of Secondary Alcohols via Photosensitization: Synthetic Utilization and Mechanistic Insights Open
An efficient metal-free photocatalytic method for the alkylation of alkenes using accessible aliphatic alcohols as redox auxiliaries is presented. C-centered radicals can be generated under mild conditions and subsequently employed in a C(…
View article: Front Cover: Meta‐Ortho Effect on the Excited State Pathways of Chloroanilines (Eur. J. Org. Chem. 1/2024)
Front Cover: Meta‐Ortho Effect on the Excited State Pathways of Chloroanilines (Eur. J. Org. Chem. 1/2024) Open
The Front Cover shows the different rates at which the excited isomeric chloroanilines can reach their respective conical intersections for non-radiative decay. The isomers of the prefulvenic conical intersections are presented as light-fu…
View article: Multi-Variable Multi-Metric Optimisation of Self-Assembled Photocatalytic CO2 Reduction Performance using Machine Learning Algorithms
Multi-Variable Multi-Metric Optimisation of Self-Assembled Photocatalytic CO2 Reduction Performance using Machine Learning Algorithms Open
The sunlight-driven reduction of CO2 into fuels and platform chemicals is a promising approach to enable a circular economy. However, established optimisation approaches are poorly suited to multi-variable multi-metric photocatalytic syste…
View article: Mechanistic Insights and Synthetic Explorations of the Photoredox-Catalyzed Activation of Halophosphines
Mechanistic Insights and Synthetic Explorations of the Photoredox-Catalyzed Activation of Halophosphines Open
The light-driven activation of halophosphines R2PX (R = alkyl- or aryl, X = Cl, Br) by an IrIII-based photocatalyst is described. It is shown that initially formed secondary phosphines R2PH react readily wi…
View article: Meta‐Ortho Effect on the Excited State Pathways of Chloroanilines
Meta‐Ortho Effect on the Excited State Pathways of Chloroanilines Open
Direct excitation of aromatic compounds grants access to high‐energy intermediates that can be utilised in organic synthesis. Understanding and predicting the substituent effects at the excited state for aromatic molecules remains challeng…
View article: Promoted Charge Separation and Long-Lived Charge-Separated State in Porphyrin-Viologen Dyad Nanoparticles
Promoted Charge Separation and Long-Lived Charge-Separated State in Porphyrin-Viologen Dyad Nanoparticles Open
Developing light-harvesting systems with efficient photoinduced charge separation and long-lived charge-separated (CS) state is desirable but still challenging. In this study, we designed a zinc porphyrin photosensitizer covalently linked …
View article: Elucidating Electron Transfer Kinetics and Optimizing System Performance for <i>Escherichia coli</i>-Based Semi-Artificial H<sub>2</sub> Production
Elucidating Electron Transfer Kinetics and Optimizing System Performance for <i>Escherichia coli</i>-Based Semi-Artificial H<sub>2</sub> Production Open
Both photo- and biocatalysis are well-established andintensivelystudied. The combination of these two approaches is also an emergingresearch field, commonly referred to as semi-artificial photosynthesis.Semi-artificial photosynthesis aims …
View article: Realizing Symmetry-Breaking Architectures in Soap Films
Realizing Symmetry-Breaking Architectures in Soap Films Open
In this paper, we show that soap films – typically expected to host symmetric molecular arrangements – can be constructed with differing opposite surfaces, breaking their symmetry, and making them reminiscent of functional biological motif…
View article: Harnessing Electric Fields at the Air-Water Interface: The Case of Soap Films
Harnessing Electric Fields at the Air-Water Interface: The Case of Soap Films Open
Interfacial electric-fields have since long been implicated in chemical reactivity, assuming particular relevance in, for instance, natural enzymatic systems or for key reactions influencing atmospheric chemistry. Reports documenting fanta…
View article: Mechanistic Insights into the Photocatalytic Hydrogen Production of Y5 and Y6 Nanoparticles
Mechanistic Insights into the Photocatalytic Hydrogen Production of Y5 and Y6 Nanoparticles Open
Utilization of solarenergy in organic semiconductorsrelies oncomplicated photophysical processes due to the strong electron-holeinteractions. To gain a better understanding of these processes andtheir effect on the photocatalytic performan…
View article: Charge Recombination Deceleration by Lateral Transfer of Electrons in Dye-Sensitized NiO Photocathode
Charge Recombination Deceleration by Lateral Transfer of Electrons in Dye-Sensitized NiO Photocathode Open
Control of charge separation and recombination is critical for dye-sensitized solar cells and photoelectrochemical cells, and for p-type cells, the latter process limits their photovoltaic performance. We speculated that the lateral electr…