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A Crystalline Phosphaalkene Radical Anion
- Pan, Xiaobo, Wang, Xingyong, Zhao, Yue, Sui, Yunxia, Wang, Xinping
- Journal of the American Chemical Society 2014 v.136 no.28 pp. 9834-9837
- X-ray diffraction, anions, chemical bonding, electron paramagnetic resonance spectroscopy, free radicals, phosphorus, salts, ultraviolet-visible spectroscopy
- Salts containing phosphaalkene radical anions have been isolated and characterized by electron paramagnetic resonance (EPR) spectroscopy, UV–vis absorption spectroscopy, and single-crystal X-ray diffraction. The radical anions feature elongated P–C bonds and an aromatization of fulvene compared to the neutral phosphaalkene. Their EPR spectra and theoretical calculations indicate the spin density of the radicals mainly resides on phosphorus atoms. This work provides the first example of a crystalline phosphaalkene radical anion.