Charge Determines Guest Orientation: A Combined NMR and Molecular Dynamics Study of β-Cyclodextrins and Adamantane Derivatives

Research output: Contribution to journalJournal articlepeer-review

Abstract

The strong binding of the adamantyl moiety to the cavity of β-cyclodextrin makes it a common binding motif in supramolecular chemistry and a common model system. Despite the attention, there are still unresolved questions regarding the orientation of the adamantane derivatives in the inclusion complexes-do they protrude from the wide or narrow opening of the cyclodextrin hosts? A combined analysis of ROESY NMR and molecular dynamics simulations allows the conclusion that positively charged adamantane derivatives are oriented with the hydrophilic group protruding from the wider opening of the cyclodextrin, while negatively charged adamantane derivatives form two coexisting types of complexes where the hydrophilic group respectively protrudes from the wide and narrow opening. Interestingly, structural modifications of the cyclodextrin host only have a slight impact on the guest orientation.
Original languageEnglish
JournalJournal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
Volume122
Issue number18
Pages (from-to)4821–4827
Number of pages7
ISSN1520-6106
DOIs
Publication statusPublished - 2018

Cite this