Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 5, Pages 2094-2100Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja4123973
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Funding
- Engineering and Physical Sciences Research Council (EPSRC)
- Swiss National Science Foundation
- Marie Curie Intra European Fellowship within the 7th European Framework Program
- Marie Curie International Incoming Fellowship within the 7th European Framework Program
- Fundacion Ramon Areces
- Deutsche Akademia der Naturforscher Leopoldina [BMBF LPD 9901/8-166]
- Peter und Traudl Engelhorn-Stiftung
- EPSRC [EP/F004567/1, EP/H021620/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F004567/1, EP/H021620/2] Funding Source: researchfish
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We report on the design, synthesis, and operation of a bimetallic molecular biped on a three-foothold track. The walker features a palladium(11) complex foot that can be selectively stepped between 4-dimethylaminopyridine and pyridine ligand sites on the track via reversible protonation while the walker remains attached to the track throughout by means of a kinetically inert platinum(11) complex foot. The substitution pattern of the three ligand binding sites, together with the kinetic stability of the metal ligand coordination bonds, affords the two positional isomers a high degree of metastability, meaning that altering the chemical state of the track does not automatically instigate stepping in the absence of an additional stimulus (heat in the presence of a coordinating solvent). The use of metastable metal complexes for foot track interactions offers a promising alternative to dynamic covalent chemistry for the design of small-molecule synthetic molecular walkers.
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