Self-sorting processes in a stimuli-responsive supramolecular systems based on cucurbituril, cyclodextrin and bisstyryl guests

摘要

We report a four-component mixture comprising bisstyryl dyes, HP--CD and CB[7] that undergoes self-sorting in aqueous solution based on ion-dipole, electrostatic, charge-transfer interactions, as well as the hydrophobic effect. The formation of 1:1 and 1:2 complexes between the bisstyryl guests and HP--CD, CB[7] has been confirmed by optical and NMR spectroscopy as well as ESI-MS data. The studied supramolecular systems are stimuli responsive. Thus, protonation of bisstyryl dye based on pyridine heterocyclic residue leads to the destruction of its complexes with HP--CD. Whereas, complex of the bisstyryl dye with CB[7] based on N-methylpyridinium moiety can be replaced by Ba2+ cation.Graphical abstractThe work demonstrates that HP--CD and CB[7] are molecular containers suitable for the creation of stimuli-responsive and self-sorting systems.