Enhanced methylation rate within a foldable molecular receptor |
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Authors: | Heemstra Jennifer M Moore Jeffrey S |
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Institution: | Department of Chemistry, 600 South Mathews Avenue, The University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA. |
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Abstract: | A N,N-(dimethylamino)pyridine monomer is incorporated into the backbone of a m-phenyleneethynylene oligomer such that the pyridine nitrogen is located on the interior surface of the binding cavity in the folded structure of the oligomer. For an oligomer having a chain length of 13 monomer units, competitive inhibition experiments reveal that methyl iodide binds weakly within the oligomer cavity with an association constant K(a) = 2 M(-1), and the oligomer-methyl iodide complex reacts with unimolecular rate constant k(u) = 0.082 s(-1) to provide the methylated product. The effective molarity is calculated to be 230 M by comparison of k(u) for the 13-mer with the second-order rate constant for a 3-mer that is too short to fold and thus unable to bind methyl iodide. |
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