Six states switching of redox-active molecular tweezers by three orthogonal stimuli

Abstract : A six level molecular switch based on terpyridine(Ni-salphen) 2 tweezers and addressable by three orthogonal stimuli (metal coordination, redox reaction and guest binding) is reported. By a metal coordination stimulus, the tweezers can be mechanically switched from an open " W "-shaped conformation to a closed " U "-shaped form. Theses two states can each be reversibly oxidized by the redox stimulus and bind to a pyrazine guest resulting in four additional states. All six states are stable and accessible by the right combination of stimuli and were studied by NMR, XRD, EPR spectroscopy and DFT calculations. The combination of the supramolecular concepts of mechanical motion and guest binding with the redox non-innocent and valence tautomerism properties of Ni-salphen complexes added two new dimensions to a mechanical switch.
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Journal of the American Chemical Society, American Chemical Society, 2017, 139 (27), pp.9213-9220. 〈10.1021/jacs.7b02945〉
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Benjamin Doistau, Lorien Benda, Jean-Louis Cantin, Lise-Marie Chamoreau, Eliseo Ruiz, et al.. Six states switching of redox-active molecular tweezers by three orthogonal stimuli. Journal of the American Chemical Society, American Chemical Society, 2017, 139 (27), pp.9213-9220. 〈10.1021/jacs.7b02945〉. 〈hal-01543708〉

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