Differences in Cucurbit[7]uril: Surfactant Complexation Promoted by the Cationic Head Group.

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ID: 88497
2013
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Abstract
The formation of host/guest complexes between cucurbit[7]uril (CB7) and tetradecyltrialkylammonium bromide surfactants with trimethyl (C TMA ), triethyl (C TEA ), and tripropyl (C TPA ) head groups was studied. Complexation was studied by ESI-MS, isothermal titration calorimetry (ITC), and NMR spectroscopy. The structure of the complexes is strongly dependent on the surfactant head group. Both 1:1 and 2:1 complexes are formed with all cationic surfactants. The magnitude of the K binding constants decreases with the alkyl length of the head group, whereas that of the K binding constants is independent of the nature of the surfactant head group. Distinct structures were found for the 1:1 and 2:1 complexes. C TMA and C TPA surfactants form 1:1 inclusion complexes that comprise the head group close to the CB7 portal and 2:1 external complexes with both host molecules near the head group. The 1:1 complexes between C TEA and CB7 showed that the head group was centered inside the CB7 cavity, whereas in the 2:1 complex the second molecule of CB7 was located at the end of the main alkyl chain.
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pessgo2013differenceschempluschem Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Pessêgo, Márcia;Da Silva, José P;Moreira, José A;García-Río, Luis;
Journal chempluschem
Year 2013
DOI
10.1002/cplu.201300164
URL
Keywords
surfactants supramolecular chemistry host-guest systems binding constants cucurbiturils

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