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Evidence of higher complexes between cucurbit[7]uril and cationic surfactants
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Orientador(es)
Resumo(s)
The 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.
Descrição
Palavras-chave
Inclusion compounds Kinetics NMR spectroscopy Supramolecular chemistry Surfactants
Contexto Educativo
Citação
Pessêgo, 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.
Editora
Wiley-VCH