Molecules (Jan 2021)

Helicity: A Non-Conventional Stereogenic Element for Designing Inherently Chiral Ionic Liquids for Electrochemical Enantiodifferentiation

  • Francesca Fontana,
  • Greta Carminati,
  • Benedetta Bertolotti,
  • Patrizia Romana Mussini,
  • Serena Arnaboldi,
  • Sara Grecchi,
  • Roberto Cirilli,
  • Laura Micheli,
  • Simona Rizzo

DOI
https://doi.org/10.3390/molecules26020311
Journal volume & issue
Vol. 26, no. 2
p. 311

Abstract

Read online

Configurationally stable 5-aza[6]helicene (1) was envisaged as a promising scaffold for non-conventional ionic liquids (IL)s. It was prepared, purified, and separated into enantiomers by preparative HPLC on a chiral stationary phase. Enantiomerically pure quaternary salts of 1 with appropriate counterions were prepared and fully characterized. N-octyl-5-aza[6]helicenium bis triflimidate (2) was tested in very small quantities as a selector in achiral IL media to perform preliminary electrochemical enantiodifferentiation experiments on the antipodes of two different chiral probes. The new organic salt exhibited outstanding enantioselection performance with respect to these probes, thus opening the way to applications in the enantioselective electroanalysis of relevant bioactive molecules.

Keywords