期刊
TETRAHEDRON
卷 68, 期 22, 页码 4296-4301出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2012.03.044
关键词
Host-guest complex; Self-assembly; Liposome; Ionic liquids; Cucurbit[n]urils
资金
- Spanish Ministry of Science and Education [CTQ2009-11587, CTQ2010-18671]
- Spanish Ministry [CTQ2007-67805]
Two symmetric amphiphilic imidazolium ionic liquids having omega-undecenyl chains form supramolecular complexes with CB[7] and CB[8] in water as revealed by H-1 NMR spectroscopy and MALDI-MS. Binding constants in the range 10(4) to 10(5) M-1 were estimated from the conductivity measurements for the 1:1 complexes of these imidazolium ionic liquids with CB[7] and CB[8]. Radical initiated polymerization of these host-guest complexes at concentrations above the critical self-assembly concentration of imidazolium ionic liquids to form liposomes, destroys completely (CB[7]) or partially (CB[8]) the host-guest ionic liquid@CB[n] complex; this behaviour was proved by titration with acridine orange tricyclic dye, of CB[n]s in the colloidal solutions of the liposomes before and after performing dialysis to remove free CB [n]s. Thus, the increase in the fluorescence emission of acridine orange by CB[7] is not observed if the polymerized ionic liquid@CB[7] complex is submitted to dialysis to remove uncomplexed CB[7]. Analogous study by titration of absorbance change of acridine orange solutions caused by CB[8], reveals only a partial destruction of the host-guest complex by self-assembly of amphiphilic ionic liquid above the critical self-assembly concentration. The results obtained have been rationalized considering that the driving force for the formation of supramolecular ionic liquid@CB[n] complexes is a hydrophobic interaction between the apolar alkenyl chain and the cucurbituril interior cavity and that these hydrophobic interactions are disturbed when self-assembly leading to liposomes occurs. (c) 2012 Elsevier Ltd. All rights reserved.
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