Calix[6]arene-Based [3]Rotaxanes as Prototypes for the Template Synthesis of Molecular Capsules

In this work, the ability of several bis-viologen axles to thread a series of heteroditopic tris(N-phenylureido)calix[6]arene wheels to give interwoven supramolecular complexes to the [3]pseudorotaxane type was studied. The unidirectionality of the threading process inside these nonsymmetric wheels...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2023-01, Vol.28 (2), p.595
Main Authors: Cester Bonati, Federica, Bazzoni, Margherita, Baccini, Caterina, Zanichelli, Valeria, Orlandini, Guido, Arduini, Arturo, Cera, Gianpiero, Secchi, Andrea
Format: Article
Language:English
Subjects:
Asymmetry
calixarenes
Computer applications
Hydrocarbons
NMR Spectroscopy
Prototypes
Rotaxanes
template synthesis
viologens
Wheels
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Summary:In this work, the ability of several bis-viologen axles to thread a series of heteroditopic tris(N-phenylureido)calix[6]arene wheels to give interwoven supramolecular complexes to the [3]pseudorotaxane type was studied. The unidirectionality of the threading process inside these nonsymmetric wheels allows the formation of highly preorganised [3]pseudorotaxane and [3]rotaxane species in which the macrocycles phenylureido moieties, functionalised with either ester, carboxylic, or hydroxymethyl groups, are facing each other. As verified by NMR and semiempirical computational studies, these latter compounds possess the correct spatial arrangement of their subcomponents, which could lead, in principle, upon proper bridging reaction, to the realisation of upper-to-upper molecular capsules that are based on calix[6]arene derivatives.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28020595