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Crystal structure of the dimeric beta-cyclodextrin complex with 1,12-dodecanediol
Tzvetana Bojinova1, Heinz Gornitzka, Nancy Lauth-de Viguerie
1Laboratoire des Interactions Moléculaires et Réactivité Chimique et Photochimique (UMR 5623), Bâtiment 2R1, Université Paul Sabatier, 118 route de Narbonne, F-31062 Toulouse, France.
Carbohydrate Research
|April 2, 2003
Summary
The structure of beta-cyclodextrin (beta-CD) complexed with 1,12-dodecanediol reveals a [3]pseudorotaxane structure. The diol guest molecule is disordered within the beta-CD dimer cavity, with hydroxyl groups forming hydrogen bonds with interstitial water molecules.
Area of Science:
- Supramolecular Chemistry
- Crystal Engineering
- Host-Guest Chemistry
Background:
- Beta-cyclodextrin (beta-CD) is a cyclic oligosaccharide with a hydrophobic cavity, widely used in host-guest complexation.
- Dimeric beta-CD structures offer unique binding possibilities for guest molecules.
- Understanding the structural basis of these complexes is crucial for designing new materials and applications.
Purpose of the Study:
- To determine the crystal structure of the beta-cyclodextrin-1,12-dodecanediol complex.
- To elucidate the binding mode and structural features of the [3]pseudorotaxane formed.
- To investigate the role of hydrogen bonding in stabilizing the complex.
Main Methods:
- Single-crystal X-ray diffraction at 173 K.
- Crystallographic refinement to R=0.0615.
- Analysis of guest molecule disorder and intermolecular interactions.
Main Results:
- The complex crystallizes in the triclinic space group P1.
- A [3]pseudorotaxane is formed, with 1,12-dodecanediol as the guest within a beta-CD dimer.
- The diol guest exhibits positional disorder, and its hydroxyl groups participate in hydrogen bonding with water molecules.
Conclusions:
- The study provides detailed structural insights into beta-cyclodextrin-diol complexation.
- The observed hydrogen bonding network highlights the importance of solvent molecules in stabilizing supramolecular assemblies.
- This structural information can guide the design of novel cyclodextrin-based materials.