Abstract
The binding constants for the inclusion complexes formed between heptakis-(2,6-di-O-methyl)-β-cyclodextrin (MβCD) and mono-(3,6-anhydro)-β-cyclodextrin (AβCD) with a set of suitably selected organic guests, were measured by means of polarimetry. Measurements were carried out at various pH values in order to ensure the correct protonation state for ionizable guests. Experimental data suggest that the binding properties of MβCD may be rationalized considering the less polar and more hydrophobic character of the cavity, although similar variations in conformational/dynamic behaviour occur as for native βCD. On the other hand, AβCD shows some similarities with αCD, due to the significant distortion in the shape and reduction in size of the macro cycle, as confirmed also by simple computational models.
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Notes
The K value for 4 found by us is much lower than the one previously measured calorimetrically by Bertrand (380 M−1, see ref. 16), but at a different pH value.
Noticeably, guests 4–10 constitute on the whole a representative set of nitrobenzene derivatives. One would expect data could be subjected to some sort of LFER (such as Hammett or Taft) correlation analysis. However, these systems are so strictly affected by the occurrence of specific (hydrogen bond, for instance) interactions that this approach is matter-of-factly unsuitable. In particular, on considering p-nitroanilines 6–10, we have to assume that possible variations of electronic effects for the aromatic moiety are almost negligible.
A pictorial representation of a typical trend for experimental data can be found in ref. [48].
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Meo, P.L., D’Anna, F., Riela, S. et al. Binding properties of heptakis-(2,6-di-O-methyl)-β-cyclodextrin and mono-(3,6-anhydro)-β-cyclodextrin: a polarimetric study. J Incl Phenom Macrocycl Chem 71, 121–127 (2011). https://doi.org/10.1007/s10847-010-9915-0
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DOI: https://doi.org/10.1007/s10847-010-9915-0