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Guest releasing from solution to solid-state triggered by cyclomaltohexaose (α-cyclodextrin) aggregation.

Zhuo-Yi Gu1, Dong-Sheng Guo, Yu Liu

  • 1Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, PR China.

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|October 26, 2010
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Summary

Cyclomaltohexaose forms supramolecular complexes with azodipyridine isomers. Different nitrogen positions in the isomers lead to distinct binding modes and aggregation structures in solution and solid states.

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Area of Science:

  • Supramolecular Chemistry
  • Crystal Engineering
  • Host-Guest Chemistry

Background:

  • Cyclomaltohexaose (cyclodextrin) is a versatile host molecule.
  • Azodipyridine isomers offer unique structural and electronic properties for complexation.
  • Understanding host-guest interactions is crucial for designing functional materials.

Purpose of the Study:

  • To synthesize and characterize supramolecular complexes of cyclomaltohexaose with 4,4'-azodipyridine and 2,2'-azodipyridine.
  • To investigate the binding abilities and assembly behaviors of these complexes in solution and solid states.
  • To elucidate the influence of azodipyridine isomer structure on complex stoichiometry and aggregation.

Main Methods:

  • X-ray crystallography for solid-state structure determination.
  • 2D NMR spectroscopy for solution-state analysis.
  • Isothermal titration calorimetry (ITC) for binding thermodynamics.

Main Results:

  • Supramolecular complexes 1 (with 4,4'-azodipyridine) and 2 (with 2,2'-azodipyridine) were successfully prepared.
  • Solution studies suggest 1:1 host-guest complexation, while solid-state analysis reveals a 2:1 stoichiometry.
  • Complex 1 exhibits channel-type aggregation, whereas complex 2 displays layer-type packing.
  • The positional difference of nitrogen atoms in the azodipyridine isomers dictates distinct binding modes and aggregation patterns.

Conclusions:

  • The nitrogen atom position in azodipyridine isomers significantly impacts supramolecular assembly.
  • Stoichiometry and aggregation modes differ between solution and solid states.
  • Structural variations in guest molecules can be exploited to control the formation of specific supramolecular architectures.