Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/40231
Título : Solvophobic effect of 1-alkyl-3-methylimidazolium chloride on the thermodynamic of complexation between β-cyclodextrin and dodecylpyridinium cation
Autor: Agudelo, Álvaro Javier Patiño
Coelho, Yara Luiza
Ferreira, Guilherme Max Dias
Ferreira, Gabriel Max Dias
Hudson, Eliara Acipreste
Pires, Ana Clarissa dos Santos
Silva, Luis Henrique Mendes da
Palavras-chave: Inclusion complex
Ionic liquids
Isothermal titration calorimetry
β-cyclodextrin
1-dodecylpyridinium chloride
Publicador: Elsevier
Data da publicação: Dez-2019
Referência: AGUDELO, Á. J. P. et al. Solvophobic effect of 1-alkyl-3-methylimidazolium chloride on the thermodynamic of complexation between β-cyclodextrin and dodecylpyridinium cation. Colloids and Surfaces A: Physicochemical and Engineering Aspects, [S.l.], v. 582, Dec. 2019.
Abstract: Preferential solvation participate in various supramolecular self-assembly processes, whose thermodynamic properties can be modulated by the addition of ionic liquids (ILs). However, the effects of these liquids on the thermodynamics of the host-guest complexation process remain unexplored. In this study, the thermodynamic properties of the complexation between 1-dodecylpyridinium cations (C12Py+) and β-cyclodextrin (βCD) species in aqueous solutions with different concentrations of 1-alkyl-3-methylimidazolium halides (CnmimX) were investigated by isothermal titration calorimetry. In water, C12Py+ and βCD form a 1:1 inclusion complex, which is enthalpically ( −9.2 ± 0.1 kJ mol−1) and entropically ( 16.1 ± 0.2 kJ mol−1) favorable. However, in IL aqueous solutions, all the βCD―C12Py+ thermodynamic parameters of the complexation change and this IL effect is dependent on the carbon chain length of Cnmim+ cations. ILs with shorter alkyl chains (Cnmim+, n ≤ 4) decreases the system entropy, while ILs with longer alkyl chains (Cnmim+, n ≥ 6) reduce the enthalpy values. These effects are attributed to i) preferential solvation of surfactant tails by ILs; ii) ability of the ILs to modify the 3D water structure and iii) inclusion of IL molecules into the inner cavities of βCD.
URI: https://www.sciencedirect.com/science/article/abs/pii/S0927775719308386
http://repositorio.ufla.br/jspui/handle/1/40231
Idioma: en_US
Aparece nas coleções:DQI - Artigos publicados em periódicos

Arquivos associados a este item:
Não existem arquivos associados a este item.


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.