A switchable palladium-complexed molecular shuttle and its metastable positional isomers |
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Authors: | Crowley James D Leigh David A Lusby Paul J McBurney Roy T Perret-Aebi Laure-Emmanuelle Petzold Christiane Slawin Alexandra M Z Symes Mark D |
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Affiliation: | School of Chemistry, University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh EH9 3JJ, United Kingdom. |
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Abstract: | We report the design, synthesis, characterization, and operation of a [2]rotaxane in which a palladium-complexed macrocycle can be translocated between 4-dimethylaminopyridine and pyridine monodentate ligand sites via reversible protonation, the metal remaining coordinated to the macrocycle throughout. The substitution pattern of the ligands and the kinetic stability of the Pd-N bond means that changing the chemical state of the thread does not automatically cause a change in the macrocycle's position in the absence of an additional input (heat and/or coordinating solvent/anion). Accordingly, under ambient conditions any of the four sets of protonated and neutral, stable, and metastable co-conformers of the [2]rotaxane can be selected, manipulated, isolated, and characterized. |
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