title: Isolation and Characterization of Radical Anions Derived from a Boryl-Substituted Diphosphene.
abstract: 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.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan.
authors.forename: Shun-Suke
authors.initials: SS
authors.lastname: Asami
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Ishida
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan.
authors.forename: Takeaki
authors.identifier: 0000-0002-8556-5785
authors.initials: T
authors.lastname: Iwamoto
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan.
authors.forename: Katsunori
authors.initials: K
authors.lastname: Suzuki
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603, Japan.|Research Development Initiative, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, T, okyo, 112-8551, Japan.
authors.forename: Makoto
authors.identifier: 0000-0002-3665-5311
authors.initials: M
authors.lastname: Yamashita
keywords: ESR spectroscopy; boron; density functional calculations; diphosphenes; radical anions