4 years ago

A pH-Dependent, Mechanically Interlocked Switch: Organometallic [2]Rotaxane vs. Organic [3]Rotaxane

Alexander Pöthig, Philipp Johannes Altmann
We present the first [2]rotaxane featuring an organometallic host. In contrast to the known organic scaffolds, this assembly shows a high post-synthetic modifiability: The reactivity of the Ag8-pillarplex host is fully retained as is exemplified by the first transmetallation in a rotaxane framework to the respective Au8-analogue. Additionally, an acidic transformation to a purely organic [3]rotaxane is demonstrated which is reversible upon addition of an adequate base - rendering the assembly a pH-dependent switch. Hereby, it is shown that the mechanically interlocked nature of the system enhances the kinetic stability of the NHC host complex by a factor of > 1000 which resembles the first observation of a stabilizing "rotaxand-effect".

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201709921

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