Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 19, Pages 6466-6470Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201504649
Keywords
calixarene; host-guest interactions; micelle; self-sorting; supramolecular chemistry
Categories
Funding
- Ministerio de Economia y Competitividad of Spain [CTQ2014-55208-P]
- Xunta de Galicia [2007/085]
- Associated Laboratory for Sustainable Chemistry-Clean Processes and Technologies-LAQV from FCT/MEC [UID/QUI/50006/2013]
- ERDF [POCI-01-0145-FEDER-007265]
- [SFRH/BPD/84805/2012]
Ask authors/readers for more resources
Molecular recognition of small molecules and ions by artificial receptors in microheterogeneous media such as micelles and vesicles can, in principle, provide better models of biological systems in comparison with bulk solutions. In this work we have investigated the complexation of an organic fluorescent probe with amphiphilic calixarene receptor below and above the critical micelle concentration (CMC). For concentrations below the CMC, the probe forms a host-guest complex with the calixarene behaving like a traditional host-guest system operating in bulk solution. Above the CMC, multiple equilibrium processes are established and the probe can exchange between the recognition site of the calixarene in the monomeric state, micellized state and/or the micellar hydrophobic core. Careful analysis of the results obtained from NMR spectroscopy and fluorescence experiments allowed us to propose a quantitative model to describe the system. The increment of the local concentration of Na+ counterions at the Stern layer displace the dye to the micelle core through competitive binding of Na+ in the cavity of the receptor and is decisive for the observed self-sorting behavior.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available