Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 2, Pages 716-720Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201912016
Keywords
host-guest systems; molecular tweezers; self-assembly; sulfur heterocycles; supramolecular chemistry
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Funding
- French Embassy in Kiev (Ukr)
- National FT-ICR network [FR 3624 CNRS]
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Developing methodologies for on-demand control of the release of a molecular guest requires the rational design of stimuli-responsive hosts with functional cavities. While a substantial number of responsive metallacages have already been described, the case of coordination-tweezers has been less explored. Herein, we report the first example of a redox-triggered guest release from a metalla-assembled tweezer. This tweezer incorporates two redox-active panels constructed from the electron-rich 9-(1,3-dithiol-2-ylidene)fluorene unit that are facing each other. It dimerizes spontaneously in solution and the resulting interpenetrated supramolecular structure can dissociate in the presence of an electron-poor planar unit, forming a 1:1 host-guest complex. This complex dissociates upon tweezer oxidation/dimerization, offering an original redox-triggered molecular delivery pathway.
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