Counterion-Controlled Self-Sorting in an Amphiphilic Calixarene Micellar System

Chemistry : a European Journal
Silvia Fernández-AbadLuis García-Río

Abstract

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.

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Citations

Jun 2, 2017·Chemical Communications : Chem Comm·Nuno BasílioA Jorge Parola
Dec 12, 2017·Chemical Communications : Chem Comm·Qian ZhaoYu Liu
May 29, 2018·Chemical Communications : Chem Comm·Qian Zhao, Yu Liu
Jun 19, 2018·Chemical Communications : Chem Comm·Qian Zhao, Yu Liu
Feb 21, 2019·Chemical Communications : Chem Comm·Xinyu HuXiaojing Chen
Nov 1, 2017·ChemPlusChem·Carmelo SgarlataCarmela Bonaccorso
Sep 28, 2017·Analytical Chemistry·Yang LiuRichard J Hooley
Nov 18, 2021·Physical Chemistry Chemical Physics : PCCP·Mhejabeen Sayed, Haridas Pal

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