Abstract
We report a four-component mixture comprising bisstyryl dyes, HP-β-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-β-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-β-CD. Whereas, complex of the bisstyryl dye with CB[7] based on N-methylpyridinium moiety can be replaced by Ba2+ cation. The work demonstrates that HP-β-CD and CB[7] are molecular containers suitable for the creation of stimuli-responsive and self-sorting systems.
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