Homoconjugation vs. exciton coupling in chiral α,β-unsaturated bicyclo[3.3.1]nonane dinitrile and carboxylic acids

Molecules. 2014 Jul 8;19(7):9893-906. doi: 10.3390/molecules19079893.

Abstract

The chiroptical properties of enantiomerically pure bicyclo[3.3.1]nona-2,6-diene-2,6-dicarbonitrile and related acids were studied by circular dichroism spectroscopy and theoretical computations. A consideration of the molecular structure of the synthesized difunctional compounds revealed that chromophores are predisposed to transannular through-space interaction due to a favourable conformation of the bicyclic skeleton and a rather small interchromophoric distance. Evidence for non-exciton-type coupling between the two acrylonitrile and acrylate moieties in 3 and 4, respectively, was obtained by chiroptical spectroscopy and DFT calculations.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkanes / chemical synthesis
  • Alkanes / chemistry*
  • Carboxylic Acids / chemical synthesis
  • Carboxylic Acids / chemistry*

Substances

  • Alkanes
  • Carboxylic Acids
  • nonane