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Induced-fit molecular recognition with water-soluble cavitands
1The Skaggs Institute for Chemical Biology and The Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 10, 2000
Summary
Novel water-soluble cavitands (host molecules) were synthesized. These cavitands form stable complexes with lipophilic guests, exhibiting slow guest exchange rates, which is beneficial for molecular recognition applications.
Area of Science:
- Supramolecular Chemistry
- Organic Chemistry
Background:
- Cavitands are macrocyclic hosts with tunable cavities.
- Water-soluble hosts are valuable for biological and environmental applications.
- Controlling guest binding and exchange is crucial for host-guest chemistry.
Purpose of the Study:
- To synthesize novel water-soluble cavitands (1 and 2).
- To investigate their complexation with lipophilic guests (caviplexes).
- To characterize the binding kinetics and thermodynamics.
Main Methods:
- Synthesis of novel water-soluble cavitands.
- Spectroscopic analysis (NMR) to study complex formation and guest exchange.
- Determination of association constants (Ka) in aqueous and methanolic solutions.
Main Results:
- Water solubility achieved through ammonium and amide groups.
- D2d velcraplex dimers observed in solution, with conformational changes upon guest addition.
- Slow guest exchange rates (NMR time-scale) and determined association constants.
- Direct observation and stoichiometry of caviplexes confirmed.
Conclusions:
- Novel water-soluble cavitands with significant binding affinities were developed.
- The synthesized cavitands exhibit slow guest exchange, indicating stable complex formation.
- These cavitands show promise for applications requiring selective molecular recognition and encapsulation.