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Cucurbit[10]uril.

Simin Liu1, Peter Y Zavalij, Lyle Isaacs

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, 20742, USA.

Journal of the American Chemical Society
|December 1, 2005
PubMed
Summary
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Melamine diamine (1) displaces CB[5] from its complex with CB[10], enabling the isolation of free CB[10]. This macrocycle binds large guests, including a cationic calix[4]arene derivative, and undergoes conformational changes with adamantane carboxylic acid (4).

Area of Science:

  • Supramolecular Chemistry
  • Host-Guest Chemistry

Background:

  • Calixarenes are macrocyclic compounds with a cavity capable of complexing various molecules.
  • CB[10] is a cucurbituril macrocycle known for its ability to bind guests.
  • Understanding guest displacement and conformational changes is crucial for designing new supramolecular systems.

Purpose of the Study:

  • To investigate the displacement of CB[5] from a CB[10]·CB[5] complex by melamine diamine (1).
  • To explore the complexation capabilities of CB[10] with large guests, including a cationic calix[4]arene derivative.
  • To study the conformational changes induced in CB[10] complexes upon addition of adamantane carboxylic acid (4).

Main Methods:

  • Displacement reactions using melamine diamine (1) to release CB[5] from CB[10]·CB[5].

Related Experiment Videos

  • Isolation of free CB[10] via chemical treatment (acetic anhydride) and solvent washing (MeOH, DMSO, water).
  • Complexation studies of CB[10] with a cationic calix[4]arene derivative and adamantane carboxylic acid (4), analyzing conformational changes.

    • Main Results:

    • Melamine diamine (1) successfully displaced CB[5] from the CB[10]·CB[5] complex, forming CB[10]·1 and precipitating CB[5].
    • Free CB[10] was isolated and shown to complex a large cationic calix[4]arene derivative (CB[10]·1,3-alt-3).
    • The addition of adamantane carboxylic acid (4) to CB[10]·3 induced a conformational change, leading to the formation of a termolecular complex (CB[10]·cone-3·4).

    Conclusions:

    • Melamine diamine is an effective agent for displacing guests from CB[10] complexes.
    • CB[10] exhibits a high capacity for complexing large and structurally diverse guests.
    • Guest binding can induce significant conformational changes in CB[10] macrocycles, offering potential for molecular recognition and sensing applications.