Abstract

A new synthetic pathway to diradical organic systems is proposed. The effectiveness of this approach was exemplified by the synthesis of a new nitroxide diradical. An interaction of perfluorobiphenyl with lithium tert-butylamide, followed by oxidation of the thusly formed N4,N4'-di-tert-butyl-2,2',3,3',5,5',6,6'-octafluorobiphenyl-4,4'-diamine with meta-chloroperoxybenzoic acid, led to the polyfluorinated nitroxide diradical, N,N'-(perfluorobiphenyl-4,4'-diyl)bis(N-tert-butyl(oxyl)amine), with a good total yield. The polyfluorinated diradical is stable and can be isolated in free form and completely characterized. The structure of the nitroxide diradical was proved by single-crystal X-ray diffraction analysis. According to the X-ray diffraction data, the diradical is considerably twisted: dihedral angles between the planes of the nitroxide groups and aromatic cycles are 65.1° and 69.5°, and between aromatic cycles 52.6°. Quantum chemical calculations predict well-balanced size of both intramolecular and intermolecular exchange interactions with J from -2.65 to -1.14 cm-1.

Original languageEnglish
Article number2701
Number of pages9
JournalMolecules (Basel, Switzerland)
Volume25
Issue number11
DOIs
Publication statusPublished - 11 Jun 2020

Keywords

  • aromatic nucleophilic substitution
  • diradicals
  • fluoroarenes
  • nitroxides
  • tert-butylanilines
  • DESIGN
  • TRIPLET
  • NITRONYL NITROXIDE
  • COMPLEXES
  • RADICALS
  • MAGNETIC-PROPERTIES
  • GROUND-STATES

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