Isolation and Characterization of Radical Anions Derived from a Boryl-Substituted Diphosphene

Shun Suke Asami, Shintaro Ishida, Takeaki Iwamoto, Katsunori Suzuki, Makoto Yamashita

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37 Citations (Scopus)


Radical anions of a diphosphene with two boryl substituents were isolated and characterized by single-crystal X-ray diffraction, electron spin resonance (ESR), and UV/Vis absorption spectroscopy as well as DFT calculations. Structural analysis of the radical anions revealed an elongation of the P=P bond and a contraction of the B−P bonds relative to the neutral diphosphene. The UV/Vis spectra of these radical anions showed a strong absorption in the visible region, which was assigned to SOMO-related transitions on the basis of DFT calculations. The ESR spectra revealed that the hyperfine coupling constant with the phosphorus nuclei is the smallest that has been reported thus far. The results of the DFT calculations furthermore suggest that this should be attributed to a soaking of electron spin to the vacant p orbitals of the boryl substituents.

Original languageEnglish
Pages (from-to)1658-1662
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number6
Publication statusPublished - 2017 Feb


  • ESR spectroscopy
  • boron
  • density functional calculations
  • diphosphenes
  • radical anions

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)


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