A catalysis-driven artificial molecular pump
| Autor: | Stephen D. P. Fielden, David A. Leigh, Shuntaro Amano |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Multidisciplinary Materials science Ratchet Supramolecular chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Ring (chemistry) 7. Clean energy 01 natural sciences 0104 chemical sciences Catalysis Axle chemistry Chemical engineering Reagent Electric potential 0210 nano-technology Crown ether |
| Zdroj: | Amano, S, Fielden, S D P & Leigh, D A 2021, ' A catalysis-driven artificial molecular pump ', Nature, vol. 594, no. 7864, pp. 529-534 . https://doi.org/10.1038/s41586-021-03575-3 Nature |
| ISSN: | 1476-4687 0028-0836 |
| DOI: | 10.1038/s41586-021-03575-3 |
| Popis: | All biological pumps are autonomous catalysts; they maintain the out-of-equilibrium conditions of the cell by harnessing the energy released from their catalytic decomposition of a chemical fuel1–3. A number of artificial molecular pumps have been reported to date4, but they are all either fuelled by light5–10 or require repetitive sequential additions of reagents or varying of an electric potential during each cycle to operate11–16. Here we describe an autonomous chemically fuelled information ratchet17–20 that in the presence of fuel continuously pumps crown ether macrocycles from bulk solution onto a molecular axle without the need for further intervention. The mechanism uses the position of a crown ether on an axle both to promote barrier attachment behind it upon threading and to suppress subsequent barrier removal until the ring has migrated to a catchment region. Tuning the dynamics of both processes20,21 enables the molecular machine22–25 to pump macrocycles continuously from their lowest energy state in bulk solution to a higher energy state on the axle. The ratchet action is experimentally demonstrated by the progressive pumping of up to three macrocycles onto the axle from bulk solution under conditions where barrier formation and removal occur continuously. The out-of-equilibrium [n]rotaxanes (characterized with n up to 4) are maintained for as long as unreacted fuel is present, after which the rings slowly de-thread. The use of catalysis to drive artificial molecular pumps opens up new opportunities, insights and research directions at the interface of catalysis and molecular machinery. A molecular-scale pump whose operation is driven by a catalytic process when in the presence of chemical fuel is autonomous, within an operating window, as long as the fuel lasts. |
| Databáze: | OpenAIRE |
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