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Anionic Boron- and Carbon-Based Hetero-Diradicaloids Spanned by a p-Phenylene Bridge.

Avijit MaitiFangyuan ZhangIvo KrummenacherMoulika BhattacharyyaSakshi MehtaMichael MoosChristoph LambertBernd EngelsAbhishake MondalHolger BraunschweigPrince RavatAnukul Jana
Published in: Journal of the American Chemical Society (2021)
Herein we report the synthesis and characterization of anionic boron- and carbon-based Kekulé diradicaloids spanned by a p-phenylene bridge. In contrast to Thiele's hydrocarbon, a closed-shell singlet system, they show an appreciable population of the triplet state at room temperature, as evidenced by both NMR and EPR spectroscopy. Moreover, en route to these anionic boron- and carbon-based hetero-diradicaloids, the formation of an isolable diamino(4-diarylboryl-phenyl)methyl radical was observed.
Keyphrases
  • room temperature
  • magnetic resonance
  • high resolution
  • ionic liquid
  • solid state
  • computed tomography
  • energy transfer
  • mass spectrometry
  • contrast enhanced