Effect of Macrocycle Size on the Self-assembly of Methylimidazolium Surfactant with Sulfonatocalix[n]arenes

Harangozó, József G. and Wintgens, Veronique and Miskolczy, Zsombor and Guigner, Jean-Michel and Amiel, Catherine and Biczók, László (2016) Effect of Macrocycle Size on the Self-assembly of Methylimidazolium Surfactant with Sulfonatocalix[n]arenes. LANGMUIR. ISSN 0743-7463 (In Press)

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The effect of macrocycle size on the association of supramolecular amphiphiles composed of 4-sulfonatocalix[n]arene and 1-methyl-3-tetradecylimidazolium (C14mim+) was studied in aqueous solutions at pH 7. When the cavitand contained four sulfonatophenol units (SCX4), spherical nanoparticle (NP) formation was observed. In contrast, both supramolecular micelle (SM) and NP formation could be attained in the presence of NaCl when the larger, more flexible 4-sulfonatocalix[8]arene (SCX8) served as host compound. The SCX8-promoted self-assembly into SM was enthalpically more favorable than NP production but the molar heat capacity changes in the two processes barely differed. Addition of 50 mM NaCl significantly increased the enthalpy of C14mim+−SCX8 NP formation making thereby the self-organization into SM more favorable. The transformation of SM into NP at high temperature was due to the substantial entropic contribution to the driving force of NP formation. The critical micelle concentration and the local polarity in the headgroup domain were considerably lower for SM compared to those of C14mim+Br conventional micelle.

Item Type: Article
Subjects: Q Science / természettudomány > QD Chemistry / kémia
Depositing User: Zsombor Miskolczy
Date Deposited: 29 Sep 2016 11:40
Last Modified: 01 Oct 2017 23:15

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