Pyrene binding to persistent micelles formed from a dendro-calixarene.
The formation of micelles of an amphiphilic dendro-calixarene (1) was studied using pyrene as a guest molecule. Steady-state fluorescence experiments were performed, which showed that pyrene is readily solubilized in the micelles and senses an environment with a moderate polarity. Time-resolved fluorescence measurements showed that pyrene in the micelles have two lifetimes, suggesting some compartmentalization of the guest within the micelles. Pyrene bound to the micelles is completely protected from the interaction with anionic species in the aqueous phase, due to the repulsion between the anions and the negatively charged micelles. Compared to conventional micelles, such as those formed with sodium dodecyl sulfate, micelles of 1 form at much lower concentrations of monomer.
Yihwa
Chang
C
Department of Chemistry, University of Victoria, PO Box 3065, Victoria, BC, Canada V8W 3V6.
Kellermann
Michael
M
Becherer
Miriam
M
Hirsch
Andreas
A
Bohne
Cornelia
C