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Related Experiment Videos

Unusually weak binding interactions in tetrazole-amidine complexes.

Alan F Tominey1, Paul H Docherty, Georgina M Rosair

  • 1Chemistry, School of Engineering & Physical Sciences, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, United Kingdom.

Organic Letters
|March 28, 2006
PubMed
Summary

Tetrazoles are often used in pharmaceuticals instead of carboxylic acids. While their binding is similar, tetrazoles form weaker bonds in amidinium complexes due to bent and longer hydrogen bonds, impacting drug efficacy.

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Area of Science:

  • Medicinal Chemistry
  • Supramolecular Chemistry
  • Organic Chemistry

Background:

  • Tetrazole moieties are frequently incorporated into pharmaceutical agents as bioisosteres for carboxylic acids.
  • Understanding the binding interactions of tetrazoles is crucial for drug design and development.

Purpose of the Study:

  • To investigate the binding affinity differences between tetrazolate and carboxylate anions in amidinium complexes.
  • To elucidate the structural basis for the observed differences in association constants.

Main Methods:

  • Comparative analysis of crystal structures of amidinium tetrazolates and amidinium carboxylates.
  • Examination of hydrogen bond geometry (angles and lengths) in both types of complexes.
  • Spectroscopic or computational methods may have been employed to determine association constants (though not explicitly stated in the abstract).

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Main Results:

  • Tetrazolate and carboxylate anions exhibit similar binding modes within amidinium complexes.
  • The association constant for tetrazolate anions is significantly lower (2-3 orders of magnitude) than that of carboxylate anions in DMSO.
  • Crystal structures reveal that N-H...N hydrogen bonds in amidinium tetrazolates are notably bent (162° and 169°) and elongated (N...N distance of 2.96 Å) compared to those in amidinium carboxylates and ammonium tetrazolates.

Conclusions:

  • The reduced binding affinity of tetrazoles in amidinium complexes is attributed to unfavorable hydrogen bond geometry.
  • The bent and longer hydrogen bonds in tetrazolate complexes weaken the overall complex stability.
  • These findings have implications for the rational design of pharmaceuticals utilizing tetrazole bioisosteres.