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Showing 1–10 of 10 results
Advanced filters: Author: Rainer Herges Clear advanced filters

  • Most cyclic conjugated molecules, such as benzene, exhibit two sides. Möbius annulenes, however, with an odd number of 180° twists in their π system, are one-sided and violate the Hückel rule. Now, using a topological trick it is demonstrated that triply twisted systems are not particularly strained and probably easier to synthesize than singly twisted ones.

    • Gaston R. Schaller
    • Filip Topić
    • Rainer Herges
    Research
    Nature Chemistry
    Volume: 6, P: 608-613

  • Hyperpolarized 13C MRI visualizes real-time metabolic processes in vivo, however, external polarizers are commonly required to produce hyperpolarized metabolites. Here, using a parahydrogen-based approach, the authors achieved up to 30% 13C polarization in situ in an MRI system for precursor molecules [1-13C]acetate and [1-13C]pyruvate ethyl esters in their perdeuterated forms, potentially facilitating future metabolic imaging applications.

    • Obaid Mohiuddin
    • Henri de Maissin
    • Andreas B. Schmidt
    ResearchOpen Access
    Communications Chemistry
    Volume: 7, P: 1-9

  • Spin-crossover complexes often lose their functionality upon adsorption on metal surfaces. Here, a metal–organic complex adsorbed on a silver surface undergoes reversible interlocked spin and coordination switching, which is enabled by an intramolecular feedback mechanism controlling the position of an axial ligand strapped to the complex.

    • Alexander Köbke
    • Florian Gutzeit
    • Manuel Gruber
    Research
    Nature Nanotechnology
    Volume: 15, P: 18-21

  • Hyperpolarized magnetic resonance imaging (MRI) has the potential to revolutionize MRI applications, but requires large and clumsy instruments. Here, the authors present a 0.5 T benchtop system that allows to hyperpolarize, image, and spy on nuclear spins like 13C within seconds.

    • Frowin Ellermann
    • Aidan Sirbu
    • Andrey N. Pravdivtsev
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-11

  • The properties of flat aromatic molecules are well known to chemists, but some non-planar aromatics remain a mystery. A molecule that can twist into a Möbius band on command might shed light on their features.

    • Rainer Herges
    News & Views
    Nature
    Volume: 450, P: 36-37

  • Rapid switching between discrete states in the solid state is a cornerstone for the technological development of devices based on stimuli-responsive materials. Here authors break the speed limit of common classes of photochromic molecules through tailoring framework environments.

    • Grace C. Thaggard
    • Kyoung Chul Park
    • Natalia B. Shustova
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-12

  • Designing systems to drive endergonic reactions using light as an energy source is a major challenge. Here a photoswitchable ligand is used to generate unstable cyclic tetravanadate species in solution.

    • Hanno Sell
    • Anika Gehl
    • Rainer Herges
    ResearchOpen Access
    Communications Chemistry
    Volume: 2, P: 1-6

  • Controlled switching of the spin state of transition metal ions is key in many enzymatic reactions, but difficult to replicate in synthetic systems. Here the authors report on an iron(III) porphyrin with a photochromic axial ligand that, in solution, reversibly switches between low-spin and high-spin upon irradiation with two different wavelengths.

    • Sreejith Shankar
    • Morten Peters
    • Rainer Herges
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-12

  • Current efforts to enhance NMR signals using the signal amplification by reversible exchange (SABRE) focus on optimizing polarization transfer from parahydrogen-derived hydride ligands to the substrate, but this requires quantitative information on ligand exchange rates, which common NMR techniques struggle to provide. Here, the authors introduce an experimental spin order transfer sequence with readout occurring at hyperpolarization-enhanced 15N nuclei that are directly interacting with the SABRE catalyst, enabling robust evaluation of ligand chemical exchange.

    • Charbel D. Assaf
    • Xin Gui
    • Andrey N. Pravdivtsev
    ResearchOpen Access
    Communications Chemistry
    Volume: 7, P: 1-10