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    Home»Science»Single ‘nanoconfined’ molecules: Making and breaking of chemical bonds: Research
    Science

    Single ‘nanoconfined’ molecules: Making and breaking of chemical bonds: Research

    By AdminOctober 26, 2022
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    Researchers around the world are working to develop efficient materials to convert CO2 into usable chemical substances — work that is particularly pressing in view of global warming. A team from the University of Göttingen, Germany, and the Ulsan National Institute for Science, South Korea, has discovered a new and promising approach: catalytically active molecules are nanoconfined — meaning they are put into an environment that leaves very little space for the single molecules — on a surface that serves as a conductive electron supplier. These molecules promote specific chemical reactions. Such hybrid systems make use of both the properties of the molecules and the properties of the substrate. The results were published in Science Advances.

    The first step for the team was to deposit the catalytically active molecules as a vapour onto polished silver before examining them with a high-resolution scanning tunneling microscope built in Göttingen. “To our absolute astonishment, the molecules arrange themselves, as if by magic, into almost perfect single-layer structures on the surface,” says Lucas Paul, PhD student, University of Göttingen, and co-author of the study.

    “In addition to imaging individual molecules, the energy of the injected electrons can be adjusted so precisely in the scanning tunneling microscope that chemical reactions can be induced and observed in a single molecule,” explains physicist Professor Martin Wenderoth. Wenderoth led the project together with chemist Professor Inke Siewert, at the University of Göttingen’s Collaborative Research Centre 1073 ‘Atomic Scale Control of Energy Conversion’. Siewert adds, “We are able to very precisely break individual chemical bonds.”

    The researchers show that molecules that are particularly densely packed on the surface have altered chemical properties. Thus, exclusively for the “trapped” molecules the bond can be broken and subsequently also restored, since the separated part of the molecule can only move very slightly away from the rest of the molecule. “This shows how a lack of space, at an atomic level, can be used to manipulate chemical reactions,” says first author Ole Bunjes, University of Göttingen.

    The research team wants their experiments to contribute to the development of efficient molecular surface systems with precisely determined properties. In addition, they want to investigate whether their new system is suitable as a molecular data memory.

    Story Source:

    Materials provided by University of Göttingen. Note: Content may be edited for style and length.

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