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  1. 18 Nov 2022 Journal Article Organic Letters

    Directed Diastereoselective Cyclopropanation and Epoxidation of Alkenyl Cyclopropyl Carbinol Derivatives

    Abstract

    We report the directed diastereoselective Simmons–Smith cyclopropanation and vanadium-catalyzed epoxidation reactions of alkenyl cyclopropyl carbinol derivatives. The reaction furnished densely substituted stereodefined bicyclopropanes and cyclopropyl oxiranes as a single diastereomer in each case. The remarkable selectivity is obtained thanks to the rigidity of the

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  2. 14 Nov 2022 Journal Article Chemistry – A European Journal

    Placing CF2 in the Center: Major Physicochemical Changes Upon a Minor Structural Alteration in Gem-Difunctional Compounds

    Sigal Saphier, Shahaf Katalan, Guy Yacov, Anat Berliner, Orit Redy-Keisar, Gil Fridkin, Lee Ghindes-Azaria, Ishay Columbus, Alexander Pevzner, Eyal Drug, Hagit Prihed, Eytan Gershonov, ... show all 16 authors
    Abstract

    Fluorine atoms play an important role in all branches of chemistry and accordingly, it is very important to study their unique and varied effects systematically, in particular, the structure-physicochemical properties relationship. The present study describes exceptional physicochemical effects resulting from a H/F exchange at the methylene bridge of gem-difunctional

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  3. 10 Nov 2022 Preprint arXiv

    Electronic band splittings across the antiferromagnetic phase transition of exfoliated MnPS3 probed by µ-ARPES

    Jeff Strasdas, Benjamin Pestka, Milosz Marcin Rybak, Adam K Budniak, Niklas Leuth, Honey Boban, Vitaliy Feyer, Iulia Cojocariu, Daniel Baranowski, José Avila, Pavel Dudin, Yaron Amouyal, ... show all 16 authors
    Abstract

    Exfoliated magnetic 2D materials provide access to a versatile tuning of magnetization properties, e.g., by gating and by proximity-induced exchange interactions with other types of 2D materials. However, the electronic band structure after exfoliation has not been probed for such materials yet, mostly due to their photochemical sensitivity. Here, we provide micron-scale

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  4. 6 Nov 2022 Preprint arXiv

    Violation of Detailed Balance in Quantum Open Systems

    Robert Alicki, David Gelbwaser-Klimovsky
    Abstract

    We consider the dynamics of a quantum system immersed in a dilute gas at thermodynamics equilibrium using a quantum Markovian master equation derived by applying the low-density limit technique. It is shown that the Gibbs state at the bath temperature is always stationary while the detailed balance condition at this state can be violated beyond the Born approximation

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  5. 3 Nov 2022 Journal Article The Journal of Physical Chemistry Letters

    Hydroxide Chemoselectivity Changes with Water Microsolvation

    Abstract

    Solvent molecules are known to affect chemical reactions, especially if they interact with one or more of the reactants or catalysts. In ion microsolvation, i.e., solvent molecules in the first solvation sphere, strong electronic interactions are created, leading to significant changes in charge distribution and consequently on their nucleophilicity/electrophilicity

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  6. 3 Nov 2022 Journal Article The Journal of Physical Chemistry A

    Singlet Fission and Aromaticity

    Abstract

    Qualitative aromaticity-based arguments are often used to explain singlet fission (SF) properties in polycyclic conjugated systems. It has been shown by Fowler and collaborators that magnetically induced ring currents are associated with transitions between occupied and unoccupied molecular orbitals (MOs). Since SF has to do with relative energies of electronic states

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  7. 3 Nov 2022 Journal Article The Journal of Physical Chemistry C

    Spectator Exciton Effects on Nanocrystal Photophysics II: PbS

    Jayanta Dana, Tufan Ghosh, Itay Gdor, Arthur Shapiro, Efrat Lifshitz, Sanford Ruhman
    Abstract

    The spectator exciton method follows stepwise changes in a nanocrystal’s absorption with the accumulated number of excitons. It involves comparison of pump–probe spectra in pristine samples with that from nanocrystals excited with a progressive number of cold excitons. Using this approach, 50% of hot electrons were shown to be blocked from cooling directly to the band

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  8. 31 Oct 2022 Journal Article Materials Advances

    Lanthanoid coordination compounds as diverse self-templating agents towards hierarchically porous Fe–N–C electrocatalysts

    Abstract

    Pore structure is a critical material property of carbon materials, determining their surface area, active site accessibility, wettability, and efficiency of bubble removal. In the self-templating approach to pore design, inorganic particles form inside a carbon during pyrolysis, templating meso- and macropores. This strategy is simple and economic, yet limited by choice

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  9. 31 Oct 2022 Journal Article Nature Communications

    Prolonged in situ self-healing in structural composites via thermo-reversible entanglement

    Alexander D Snyder, Zachary J Phillips, Jack S Turicek, Charles E Diesendruck, Kalyana B Nakshatrala, Jason F Patrick
    Abstract

    Natural processes continuously degrade a material’s performance throughout its life cycle. An emerging class of synthetic self-healing polymers and composites possess property-retaining functions with the promise of longer lifetimes. But sustained in-service repair of structural fiber-reinforced composites remains unfulfilled due to material heterogeneity and thermodynamic

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  10. 24 Oct 2022 Journal Article Chemistry of Materials

    Ternary Dumbbell Nanowires for Photocatalytic Hydrogen Production

    Abstract

    One-dimensional (1D) semiconductor heterojunctions with asymmetric or symmetric metal cocatalysts are promising systems for high-performance photocatalytic reactions such as solar-to-fuel conversion as the heterostructure junction enables improved charge separation. However, synthesizing such unique heterostructures with well-designed non-noble-metal cocatalysts in an

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