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Self-association of a naphthalene-capped-β-cyclodextrin through cooperative strong hydrophobic interactions

AuthorsGonzález-Álvarez, M. José; Méndez-Ardoy, Alejandro ; Benito, Juan M. ; García Fernández, José Manuel ; Mendicuti, Francisco
Issue Date2011
CitationJournal of Photochemistry and Photobiology A: Chemistry 223: 25- 36 (2011)
AbstractNMR, circular dichroism and fluorescence techniques were used to study the structure in solution of a new β-cyclodextrin derivate in which naphthalene chromophore group is bridged to O(2) and O(3) secondary positions of the same glucopyranose unit through a bidentate hinge. The results point to the formation of a very stable dimer in aqueous solution which dissociates in non-polar solvents. Dimerization was enthalpy and entropy favoured. The hydrophobic character of the naphthyl moiety plays a very important role in the entropy change sign. Molecular mechanics as well as molecular dynamics calculations indicated that the most stable dimers are head-to-head oriented. For these dimer structures the naphthyl moieties, relatively shielded from the solvent, are sufficiently close to each other to couple their transition moments, but without forming excimers. © 2011 Elsevier B.V. All rights reserved.
Identifiersdoi: 10.1016/j.jphotochem.2011.07.013
issn: 1010-6030
Appears in Collections:(IIQ) Artículos
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