Pessêgo, MárciaMoreira, JoséGarcía-Río, Luís2013-12-092013-12-092012Pessêgo, Márcia; Moreira, José A.; García-Río, Luís. Evidence of Higher Complexes Between Cucurbit[7]uril and Cationic Surfactants, Chemistry - A European Journal, 18, 25, 7931-7940, 2012.09476539AUT: JMO01545;http://hdl.handle.net/10400.1/3232The host–guest assembly of CB7 with a series of alkyl(trime-ACHTUNGTRENUNGthyl)ammonium (CnTA+) surfactants of different chain lengths (n=6–18) has been studied. The complexation behaviour was investigated by NMR spectroscopy, isothermal titration calorimetry and kinetics measurements. The combined results of these techniques provided evidence for the formation of 1:1 inclusion and 2:1 external complexes in the cases of CnTA+ with n=12–18. The binding constants for the 1:1 complexes are independent of the alkyl chain length of the surfactant, whereas a relationship between K2:1 and the chain length of the surfactant was found for the 2:1 complexes.engInclusion compoundsKineticsNMR spectroscopySupramolecular chemistrySurfactantsjournal article2013-12-04http://dx.doi.org/10.1002/chem.201103049