Self-assembly of a calixarene bearing a 12-aminododecyl pendant group on the lower rim into supra- molecular 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.
|Titolo:||Counterion-dependent proton-driven self-assembly of linear supramolecular oligomers based on amino-calixarene building blocks|
|Data di pubblicazione:||2007|
|Citazione:||Counterion-dependent proton-driven self-assembly of linear supramolecular oligomers based on amino-calixarene building blocks / PAPPALARDO S; VILLARI V; SLOVAK S; COHEN Y; GATTUSO G; NOTTI A; PAPPALARDO A; PISAGATTI I; PARISI M. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - 13(2007), pp. 8164-8173.|
|Appare nelle tipologie:||1.1 Articolo in rivista|