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Enhanced methylation rate within a foldable molecular receptor.
Jennifer M Heemstra1, Jeffrey S Moore
1Department of Chemistry, 600 South Mathews Avenue, The University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA.
The Journal of Organic Chemistry
|December 22, 2004
Summary
This study incorporates a pyridine monomer into an oligomer, creating a binding cavity. Methyl iodide binds weakly within this cavity, demonstrating effective molarity for the folded structure.
Area of Science:
- Supramolecular Chemistry
- Organic Chemistry
- Polymer Science
Background:
- Oligomers can form specific binding cavities through folding.
- Incorporating functional monomers can tailor cavity properties.
Purpose of the Study:
- To investigate the binding and reaction of methyl iodide within a folded m-phenyleneethynylene oligomer cavity.
- To determine the effective molarity of the binding interaction.
Main Methods:
- Synthesis of a m-phenyleneethynylene oligomer containing a N,N-(dimethylamino)pyridine monomer.
- Competitive inhibition experiments to quantify methyl iodide binding.
- Kinetic studies to determine association and unimolecular rate constants.
Main Results:
- The 13-mer oligomer forms a binding cavity with the pyridine nitrogen exposed internally.
- Methyl iodide exhibits weak binding (K(a) = 2 M⁻¹) within the cavity.
- The oligomer-methyl iodide complex reacts with a unimolecular rate constant (k(u) = 0.082 s⁻¹).
- An effective molarity of 230 M was calculated for the binding interaction.
Conclusions:
- Folded m-phenyleneethynylene oligomers can effectively bind small molecules like methyl iodide.
- The internal pyridine nitrogen plays a role in the binding and subsequent reaction.
- This work demonstrates the potential of self-folding oligomers for molecular recognition and reaction.