4-Sulfonatocalix[6]arene-induced aggregation of ionic liquids

Wintgens, Veronique and Le Coeur, Clémence and Amiela, Catherine and Guigner, Jean-Michel and Harangozó, József G. and Miskolczy, Zsombor and Biczók, László (2013) 4-Sulfonatocalix[6]arene-induced aggregation of ionic liquids. LANGMUIR, 29 (25). pp. 7682-7688. ISSN 0743-7463

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Abstract

The interaction of 4-sulfonatocalix[6]arene (SCX6) macrocycle with 1-alkyl-3-methylimidazolium type of ionic liquids possessing dodecyl, tetradecyl, or hexadecyl substituent was studied in aqueous solution at 298 K. Host-guest complexation promoted the spontaneous self-assembly into nanoparticles of 7:1 ionic liquid:SCX6 stoichiometry. Positively charged and stable nanoparticles were produced in solutions of 7-200-fold excess of ionic liquid as compared to the amount of SCX6. The negatively charged nanoparticles formed in solutions having 2-7 ionic liquid:SCX6 molar ratios evolved into larger species. The stability of the nanoparticles increased with the lengthening of aliphatic chain of the ionic liquid. Cryo-TEM experiments showed dense particles generally with spherical shape and multilayered structure, which has been confirmed by small-angle neutron scattering. © 2013 American Chemical Society.

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