An alcohol-functionalized cyclophane has been shown to form a bowl-shaped cavity large enough to host tris(bipyridine)ruthenium(ii). The macrocycle captures, and suppresses the activity of, the ruthenium complex in water but, when oxidized to its ketone-bearing counterpart, releases the ruthenium guest.
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Van Craen, D. Pop-up rings to rule reactivity. Nat. Chem. 14, 971–972 (2022). https://doi.org/10.1038/s41557-022-01033-9
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DOI: https://doi.org/10.1038/s41557-022-01033-9