Premium
Evidence of Higher Complexes Between Cucurbit[7]uril and Cationic Surfactants
Author(s) -
Pessêgo M.,
Moreira J. A.,
GarciaRio L.
Publication year - 2012
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201103049
Subject(s) - isothermal titration calorimetry , cationic polymerization , pulmonary surfactant , alkyl , chemistry , kinetics , titration , calorimetry , crystallography , ammonium , isothermal process , homologous series , stereochemistry , polymer chemistry , inorganic chemistry , organic chemistry , thermodynamics , biochemistry , physics , quantum mechanics
The host–guest assembly of CB7 with a series of alkyl(trimethyl)ammonium (C n TA + ) 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 C n TA + 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 K 2:1 and the chain length of the surfactant was found for the 2:1 complexes.