Restricting shuttling in bis(imidazolium)…pillararene rotaxanes using metal coordination
Metal coordination to a series of bis (imidazolium)…pillararene rotaxanes through the formation of metal–carbene bonds facilitates a new strategy to restrict the shuttling motion in rotaxanes. Whereas the pillararene macrocycle rapidly shuttles along the full length of the bis (imidazolium) rod for the parent 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 rotaxane. The Ag(I) coordinated rotaxanes can be reacted further, either removing the Ag–carbene species to recreate the parent rotaxane, or reaction with more bulky Pd(II) species to further restrict the shuttling motion through steric inhibition.
- This article is part of the themed collection: Dalton Transactions HOT Articles