AI Article Synopsis
- The study highlights how a calix[5]arene molecule with a specific pendant group can spontaneously form larger structures (oligomers) when it comes into contact with acidic solutions and can revert back to its original form with a base.
- Analysis techniques like 1H NMR, diffusion NMR, light scattering, ESI-MS, and SEM were used to confirm the presence and characteristics of these oligomers under different conditions and environments.
- The research indicates that the size of the oligomers is influenced by factors such as concentration and the type of counterions present, leading to variations due to ion interactions.
Article Abstract
Self-assembly of a calix[5]arene bearing a 12-aminododecyl pendant group on the lower rim into supramolecular oligomers through intermolecular iterative inclusion events is readily triggered by contact with acid solutions and is reversed to the amino monomer precursor by treatment with a base. 1H NMR data are consistent with the formation of head-to-tail assemblies derived from endo-cavity inclusion of the alkylammonium moiety. Diffusion NMR and light-scattering studies provide evidence for the presence of oligomers in solution and show that different counterions and concentrations result in different oligomer sizes, whereas ESI-MS and SEM investigations, respectively, indicate that self-assembly also takes place in the gas phase and in the solid state. The growth of these supramolecular oligomers is concentration-dependent; however, as a consequence of the saline nature of the monomer, it also shows a distinct counterion-dependence owing to ion-pairing/solvation effects.
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| http://dx.doi.org/10.1002/chem.200601785 | DOI Listing |
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