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Restricting shuttling in bis(imidazolium)…pillar[5]arene rotaxanes using metal coordination

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Abstract

Metal coordination to a series of bis (imidazolium)…pillar[5]arene [2]rotaxanes through the formation of metal–carbene bonds facilitates a new strategy to restrict the shuttling motion in [2]rotaxanes. Whereas the pillar[5]arene macrocycle rapidly shuttles along the full length of the bis (imidazolium) rod for the parent [2]rotaxane, Ag(I) coordination to the imidazolium groups through the formation of N-heterocyclic carbenes leads to restricted motion, effectively confining the shuttling motion of the [2]rotaxane. The Ag(I) coordinated [2]rotaxanes can be reacted further, either removing the Ag–carbene species to recreate the parent [2]rotaxane, or reaction with more bulky Pd(II) species to further restrict the shuttling motion through steric inhibition.

Graphical abstract: Restricting shuttling in bis(imidazolium)…pillar[5]arene rotaxanes using metal coordination

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Publication details

The article was received on 12 Oct 2018, accepted on 31 Oct 2018 and first published on 07 Nov 2018


Article type: Paper
DOI: 10.1039/C8DT04096F
Citation: Dalton Trans., 2018, Advance Article
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    Restricting shuttling in bis(imidazolium)…pillar[5]arene rotaxanes using metal coordination

    P. Langer, L. Yang, C. R. Pfeiffer, W. Lewis and N. R. Champness, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT04096F

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