Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 139, Issue 27, Pages 9213-9220Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b02945
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Funding
- ANR SMARTEES [15-CE07-0006-01]
- Spanish Ministerio de Economia y Competitividad [CTQ2015-64579-C3-1-P]
- Generalitat de Catalunya
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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 noninnocent and valence tautomerism properties of Ni-salphen complexes added two new dimensions to a mechanical switch.
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