Utilize este identificador para referenciar este registo:
|Título:||Differences in cucurbituril: surfactant complexation promoted by the cationic head group|
Silva, José P. da
Moreira, José A.
|Citação:||Pessêgo, Márcia; Da Silva, José P.; Moreira, José A.; García-Río, Luis. Differences in Cucurbituril: Surfactant Complexation Promoted by the Cationic Head Group, ChemPlusChem, 78, 9, 1058-1064, 2013.|
|Resumo:||The formation of host/guest complexes between cucurbituril (CB7) and tetradecyltrialkylammonium bromide surfactants with trimethyl (C14TMA+), triethyl (C14TEA+), and tripropyl (C14TPA+) 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 K1:1 binding constants decreases with the alkyl length of the head group, whereas that of the K2:1 binding constants is independent of the nature of the surfactant head group. Distinct structures were found for the 1:1 and 2:1 complexes. C14TMA+ and C14TPA+ 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 C14TEA+ 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.|
|Aparece nas colecções:||FCT2-Artigos (em revistas ou actas indexadas)|
Ficheiros deste registo:
|ChemPlusChem 2013 Pessêgo.pdf||1,58 MB||Adobe PDF||Ver/Abrir Acesso Restrito. Solicitar cópia ao autor!|
Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.