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Dynamic combinatorial libraries based on hydrogen-bonded molecular boxes.

Jessica M C A Kerckhoffs1, Miguel A Mateos-Timoneda, David N Reinhoudt

  • 1Laboratory of Supramolecular Chemistry and Technology, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 2, 2006
PubMed
Summary

This study explores dynamic combinatorial libraries, enhancing molecular receptor binding and selection. Self-assembled receptors successfully amplified and selected the best guest binders from complex mixtures.

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Area of Science:

  • Supramolecular Chemistry
  • Chemical Biology

Background:

  • Dynamic combinatorial chemistry (DCC) enables the creation of molecular libraries that can adapt and evolve.
  • Self-assembled molecular receptors offer a platform for selective guest binding through non-covalent interactions.

Purpose of the Study:

  • To investigate the amplification and selection of molecular receptors within dynamic combinatorial libraries.
  • To explore the templating effect of a self-assembled receptor on guest molecule complexation.

Main Methods:

  • Formation of self-assembled receptors (1a-d)3.(DEB)6 using hydrogen bonds between calix[4]arene dimelamine derivatives and diethyl barbiturate (DEB).
  • Encapsulation and amplification of alizarin trimer (2a) by dynamic libraries of up to twenty receptor components.
  • Complexation studies of alizarin-like guest molecules (2a-d) with the pre-formed receptor (1a3.(DEB)6).

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Main Results:

  • The receptor assembly (1a3.(DEB)6) showed the largest amplification factor (2.8) when interacting with alizarin trimer (2a) in a four-component library.
  • Amplification of the receptor (1a3.(DEB)6) was also observed in a twenty-component library upon addition of 2a.
  • The self-assembled receptor (1a3.(DEB)6) demonstrated the ability to template the formation of the best-fitting guest trimer.

Conclusions:

  • Dynamic combinatorial libraries facilitate the selection and amplification of specific host-guest interactions.
  • Self-assembled supramolecular structures can be effectively utilized for molecular recognition and templated synthesis.