Nondegenerate pi-donor/pi-acceptor [2]catenanes containing proton-ionizable 1H-1,2,4-triazole subunits: synthesis and spontaneous resolution

Chemistry. 2007;13(14):3964-79. doi: 10.1002/chem.200601144.

Abstract

Chirality can hold the key to inducing directionality of motion in components of molecular devices. With this idea in mind, we describe here 1) the template-directed synthesis of two [2]catenanes wherein cyclobis(paraquat-p-phenylene) is interlocked with polyether macrocycles containing, in addition to one 3,5-bis(oxymethylene)-1H-1,2,4-triazole unit, either one 1,4-dioxybenzene or one 1,5-dioxynaphthalene ring system. We also report 2) the full characterization of both [2]catenanes by fast atom bombardment mass spectrometry (FABMS), X-ray crystallography, and dynamic (1)H NMR spectroscopy. We reveal 3) the fact that the [2]catenanes not only exist, both in the solution-state and in the solid-state, as strictly one of the two possible translational isomers, but that they also exhibit spontaneous resolution on crystallization leading to formation of homochiral crystals, as indicated by X-ray crystallography and circular dichroism (CD) experiments. Finally, we comment 4) on the chances of switching these catenanes chemically.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Circular Dichroism
  • Crystallography, X-Ray
  • Magnetic Resonance Spectroscopy
  • Models, Molecular
  • Protons
  • Spectrometry, Mass, Electrospray Ionization
  • Spectrometry, Mass, Fast Atom Bombardment
  • Triazoles / chemistry*

Substances

  • Protons
  • Triazoles