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Dimeric self-assembling capsules derived from the highly flexible tribenzylamine skeleton
Mateo Alajarín1, Aurelia Pastor, Raúl-Angel Orenes
1Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, Murcia-30.100, Spain. alajarin@um.es
The Journal of Organic Chemistry
|October 2, 2002
Summary
New molecular capsules formed by Tris(m-ureidobenzyl)amines self-assembly can trap small molecules. Crystal X-ray analysis confirmed the propeller-like structure and encapsulation of dichloromethane in the solid state.
Area of Science:
- Supramolecular Chemistry
- Organic Chemistry
- Materials Science
Background:
- Tris(m-ureidobenzyl)amines are novel organic compounds with potential for self-assembly.
- Molecular capsules are of interest for their ability to encapsulate guest molecules.
- Understanding self-assembly mechanisms is crucial for designing functional supramolecular structures.
Purpose of the Study:
- To investigate the self-assembly behavior of Tris(m-ureidobenzyl)amines in solid and solution states.
- To characterize the structure of the resulting molecular capsules.
- To explore the encapsulation capabilities of these novel capsules for small molecules.
Main Methods:
- Crystal X-ray analysis to determine solid-state structure.
- Nuclear Magnetic Resonance (NMR) spectroscopy to confirm self-assembly in solution.
- Encapsulation studies to assess guest molecule binding.
Main Results:
- Tris(m-ureidobenzyl)amines were found to dimerize, forming molecular capsules.
- Crystal X-ray analysis revealed a propeller-like topology with a belt of six hydrogen-bonded ureas.
- The structure confirmed the encapsulation of a dichloromethane molecule within the capsule.
- Self-assembly and encapsulation were also observed in solution.
Conclusions:
- Tris(m-ureidobenzyl)amines efficiently form self-assembled molecular capsules.
- These capsules exhibit a unique propeller-like structure stabilized by hydrogen bonding.
- The demonstrated encapsulation of small molecules highlights their potential applications in molecular recognition and storage.