Secondary dialkylammonium ions form inclusion complexes — with pseudorotaxane geometries and in varying stoichiometries — with large ring crown ethers such as dibenzo[24]crown-8 and bis-/>-phenylene[34]crown-10. The complexes are stabilised primarily by [N-H—O] and [C-H—O] hydrogen bonding interactions. The self-assembly of three new rotaxanes — and the solid state structures of eight pseudorotaxanes and a rotaxane — based on this supramolecular system is descibed.
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