Cyclic molecules have fascinated chemists for many years and researchers have now made nanoscale macromolecular 'doughnuts' that are large enough to be imaged with an atomic force microscope — providing direct visual proof of their cyclic topologies.
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Grayson, S. Polymers kept in the loop. Nature Chem 1, 178–179 (2009). https://doi.org/10.1038/nchem.226
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DOI: https://doi.org/10.1038/nchem.226
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