Supramolecular helical mesomorphic polymers. Chiral induction through H-bonding

J Am Chem Soc. 2005 Jan 12;127(1):458-64. doi: 10.1021/ja046644e.

Abstract

The work described here concerns a challenge of general interest in supramolecular chemistry: the achievement of chiral helical organizations with controlled structures. This work provides a strategy to obtain supramolecular polymers in which a chiral helical conformation has been induced by a noncovalent association, that is, through hydrogen bonding. Polycatenar 2,4,6-triarylamino-1,3,5-triazines, which organize into columnar mesophases and are susceptible to H-bonding interactions, were chosen as a starting point to build up the chiral supramolecular structure. The stacking of these mesogens has been forced to wind in a helical way by means of H-bond association with (R)-3-methyladipic acid, within the mesophase. The optically active columnar organization has been studied in depth by optical microscopy, differential scanning calorimetry (DSC), X-ray diffraction, and circular dichroism. Formation of stable complexes between the triazine units and (R)-3-methyladipic acid has also been investigated by means of NMR diffusion-ordered spectroscopy (DOSY) experiments in chloroform.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adipates / chemistry*
  • Circular Dichroism
  • Hydrogen Bonding
  • Models, Molecular
  • Polymers / chemistry*
  • Stereoisomerism
  • Triazines / chemistry*
  • X-Ray Diffraction

Substances

  • Adipates
  • Polymers
  • Triazines
  • 3-methyladipic acid